When Aether Hub enters the battlefield, you get {E} (an energy counter).

{T}: Add {C}.

{T}, Pay {E}: Add one mana of any color.

Flying

Whenever Aetherstorm Roc or another creature enters the battlefield under your control, you get {E} (an energy counter).

Whenever Aetherstorm Roc attacks, you may pay {E}{E}. If you do, put a +1/+1 counter on it and tap up to one target creature defending player controls.

Whenever a permanent you control is put into a graveyard, you get {E} (an energy counter).

{T}, Pay {E}{E}{E}{E}{E}{E}: Look at the top six cards of your library. You may cast a spell from among them without paying its mana cost. Put the rest on the bottom of your library in a random order.

{T}, Pay 1 life, Sacrifice Arid Mesa: Search your library for a Mountain or Plains card, put it onto the battlefield, then shuffle.

(Gain the next level as a sorcery to add its ability.)

The first artifact spell you cast each turn costs {1} less to cast.

{1}{U}: Level 2

When this Class becomes level 2, reveal cards from the top of your library until you reveal an artifact card. Put that card into your hand and the rest on the bottom of your library in a random order.

{5}{U}: Level 3

At the beginning of your end step, create a token that's a copy of target artifact you control.

When Assaultron Dominator enters the battlefield, you get {E}{E} (two energy counters).

Whenever an artifact creature you control attacks, you may pay {E}. If you do, put your choice of a +1/+1, first strike, or trample counter on that creature.

Whenever a creature deals damage to you, put a gold counter on it.

Each creature with a gold counter on it is a Wall in addition to its other creature types and has defender. (Those creatures can't attack.)

When Aurification leaves the battlefield, remove all gold counters from all creatures.

You may have Auton Soldier enter the battlefield as a copy of any creature on the battlefield, except it isn't legendary, is an artifact in addition to its other types, and has myriad. (Whenever it attacks, for each opponent other than defending player, you may put a token that's a copy of this creature onto the battlefield tapped and attacking that player or a planeswalker they control. Exile the tokens at end of combat.)

Metalcraft -- {T}: You get {E} (an energy counter). Activate only if you control three or more artifacts.

Whenever you get one or more {E} during your turn, creatures you control get +1/+1 until end of turn.

{T}: Add {C}.

{2}, {T}, Sacrifice Buried Ruin: Return target artifact card from your graveyard to your hand.

Clifftop Retreat enters the battlefield tapped unless you control a Mountain or a Plains.

{T}: Add {R} or {W}.

As Cloud Key enters the battlefield, choose artifact, creature, enchantment, instant, or sorcery.

Spells you cast of the chosen type cost {1} less to cast.

Domain -- Creatures can't attack you unless their controller pays {X} for each creature they control that's attacking you, where X is the number of basic land types among lands you control.

{T}: Add one mana of any color in your commander's color identity.

Put target attacking creature on the bottom of its owner's library. Its controller gains life equal to its toughness.

Choose target artifact or creature. You get {E}{E}{E}{E} (four energy counters), then you may pay an amount of {E} equal to that permanent's mana value. If you do, gain control of it.

When Consulate Surveillance enters the battlefield, you get {E}{E}{E}{E} (four energy counters).

Pay {E}{E}: Prevent all damage that would be dealt to you this turn by a source of your choice.

{T}: You get {E} (an energy counter).

{T}, Pay {E}{E}{E}: Consulate Turret deals 2 damage to target player or planeswalker.

No more than two creatures can attack you each combat.

Protector -- Other artifact creatures you control have hexproof.

Turn target creature face down. It's a 2/2 Cyberman artifact creature.

Artifact creatures you control have afflict 3. (Whenever a creature with afflict 3 becomes blocked, defending player loses 3 life.)

Nonlegendary artifact creatures you control have myriad. (Whenever a creature with myriad attacks, for each opponent other than defending player, you may create a token that's a copy of that creature that's tapped and attacking that player or a planeswalker they control. Exile the tokens at end of combat.)

Artifacts you control have indestructible. (Effects that say "destroy" don't destroy them. Artifact creatures with indestructible can't be destroyed by damage.)

Enchant creature

Enchanted creature is an Insect artifact creature with base power and toughness 0/1 and has indestructible, and it loses all other abilities, card types, and creature types.

Whenever a creature enters the battlefield under your control, you get {E} (an energy counter).

{4}, {T}: Return target creature you control to its owner's hand.

Tap target creature.

Metalcraft -- If you control three or more artifacts, exile that creature.

Whenever you cast an artifact spell, you get {E} (an energy counter).

{T}, Pay {E}: Target creature gets +1/+0 and gains trample and haste until end of turn.

{T}, Pay {E}{E}{E}: Draw a card.

{T}, Pay {E}{E}{E}{E}{E}: Return target artifact card from your graveyard to the battlefield tapped.

Whenever you cast an artifact spell, create a 1/1 colorless Thopter artifact creature token with flying.

Nonland permanents you control are artifacts in addition to their other types. The same is true for permanent spells you control and nonland permanent cards you own that aren't on the battlefield.

Whenever an artifact or Artificer enters the battlefield under your control, you may pay {1}. If you do, you get {E}{E} (two energy counters).

Pay {E}{E}{E}{E}{E}{E}, Sacrifice Era of Innovation: Draw three cards.

Whenever an opponent casts their first noncreature spell each turn, draw a card unless that player pays {X}, where X is Esper Sentinel's power.

Artifact spells you cast cost {1} less to cast.

Whenever you get one or more {E} (energy counters), put a +1/+1 counter on target creature you control.

{4}, {T}: You get {E}.

{1}, {T}: Add {U}{R}.

{T}, Pay 1 life, Sacrifice Flooded Strand: Search your library for a Plains or Island card, put it onto the battlefield, then shuffle.

Artifact spells you cast cost {1} less to cast.

Creatures can't attack you unless their controller pays {2} for each creature they control that's attacking you.

Glacial Fortress enters the battlefield tapped unless you control a Plains or an Island.

{T}: Add {W} or {U}.

{T}: Choose target artifact a player controls and target artifact card in that player's graveyard. If both targets are still legal as this ability resolves, that player simultaneously sacrifices the artifact and returns the artifact card to the battlefield.

Flying, lifelink

Each legendary permanent you control has ward {2}. (Whenever it becomes the target of a spell or ability an opponent controls, counter it unless that player pays {2}.)

Whenever Gonti's Aether Heart or another artifact enters the battlefield under your control, you get {E}{E} (two energy counters).

Pay {E}{E}{E}{E}{E}{E}{E}{E}, Exile Gonti's Aether Heart: Take an extra turn after this one.

{T}: Add {C}.

{1}, {T}: You get {E} (an energy counter).

{3}, {T}, Pay X {E}, Sacrifice HELIOS One: Destroy target nonland permanent with mana value X. Activate only as a sorcery.

({T}: Add {W} or {U}.)

As Hallowed Fountain enters the battlefield, you may pay 2 life. If you don't, it enters the battlefield tapped.

Whenever you cast a spell, proliferate. (Choose any number of permanents and/or players, then give each another counter of each kind already there.)

At the beginning of your upkeep, if you control three or more artifacts, you gain 1 life.

{T}: Add {C}.

{4}, {T}, Sacrifice Inventors' Fair: Search your library for an artifact card, reveal it, put it into your hand, then shuffle. Activate only if you control three or more artifacts.

({T}: Add {U}.)

({T}: Add {U}.)

Whenever you cast a historic spell, draw a card. (Artifacts, legendaries, and Sagas are historic.)

{T}, Sacrifice three artifacts: Search your library for an artifact card, put it onto the battlefield, then shuffle.

Flash

Flying

You may cast colorless spells and artifact spells as though they had flash.

Whenever you cast a spell, if the amount of mana spent to cast that spell is greater than Liberator, Urza's Battlethopter's power, put a +1/+1 counter on Liberator.

Vigilance, trample, haste

Whenever Liberty Prime, Recharged attacks or blocks, sacrifice it unless you pay {E}{E} (two energy counters).

{2}, {T}, Sacrifice an artifact: You get {E}{E} and draw a card.

Vigilance

At the beginning of your end step, untap each other artifact creature you control.

{3}{W}, {T}: Create a 5/5 colorless Vehicle artifact token named Zeppelin with flying and crew 3. (It has "Tap any number of creatures you control with total power 3 or more: This Vehicle becomes an artifact creature until end of turn.")

{U}, {T}, Return an artifact you control to its owner's hand: You may put an artifact card from your hand onto the battlefield.

Enchant artifact you control

At the beginning of your upkeep, create a token that's a copy of enchanted artifact. Then if you control eight or more artifacts with the same name as one another, you win the game.

When Meteor Golem enters the battlefield, destroy target nonland permanent an opponent controls.

As Mirrodin Besieged enters the battlefield, choose Mirran or Phyrexian.

• Mirran -- Whenever you cast an artifact spell, create a 1/1 colorless Myr artifact creature token.

• Phyrexian -- At the beginning of your end step, draw a card, then discard a card. Then if there are fifteen or more artifact cards in your graveyard, target opponent loses the game.

If one or more tokens would be created under your control, twice that many of those tokens are created instead.

{1}{W/P}{W/P}, Sacrifice two other artifacts and/or creatures: Put an indestructible counter on Mondrak, Glory Dominus. ({W/P} can be paid with either {W} or 2 life.)

({T}: Add {R}.)

({T}: Add {R}.)

You may look at the top card of your library any time.

You may cast artifact spells and colorless spells from the top of your library.

{T}, Pay 1 life: Exile the top card of your library.

Mystic Monastery enters the battlefield tapped.

{T}: Add {U}, {R}, or {W}.

({W/P} can be paid with either {W} or 2 life.)

Creatures can't attack you or planeswalkers you control unless their controller pays {W/P} for each of those creatures.

Vigilance

If one or more creature tokens would be created under your control, three times that many of those tokens are created instead.

When Ojer Taq dies, return it to the battlefield tapped and transformed under its owner's control.

(Transforms from Ojer Taq, Deepest Foundation.)

{T}: Add {W}.

{2}{W}, {T}: Transform Temple of Civilization. Activate only if you attacked with three or more creatures this turn and only as a sorcery.

Improvise (Your artifacts can help cast this spell. Each artifact you tap after you're done activating mana abilities pays for {1}.)

Destroy all nonartifact creatures.

Artifacts you control have hexproof.

At the beginning of your upkeep, if you control the artifact with the highest mana value or tied for the highest mana value, draw a card.

If an artifact or creature entering the battlefield causes a triggered ability of a permanent you control to trigger, that ability triggers an additional time.

Path of Ancestry enters the battlefield tapped.

{T}: Add one mana of any color in your commander's color identity. When that mana is spent to cast a creature spell that shares a creature type with your commander, scry 1. (Look at the top card of your library. You may put that card on the bottom.)

Exile target creature. Its controller may search their library for a basic land card, put that card onto the battlefield tapped, then shuffle.

({T}: Add {W}.)

({T}: Add {W}.)

({T}: Add {W} or {U}.)

Prairie Stream enters the battlefield tapped unless you control two or more basic lands.

Creatures can't attack you unless their controller pays {2} for each creature they control that's attacking you.

({T}: Add {U}, {R}, or {W}.)

Raugrin Triome enters the battlefield tapped.

Cycling {3} ({3}, Discard this card: Draw a card.)

Razortide Bridge enters the battlefield tapped.

Indestructible

{T}: Add {W} or {U}.

You have no maximum hand size.

{T}: Add {C}.

Whenever an opponent casts a spell, you may draw a card unless that player pays {1}.

Rustvale Bridge enters the battlefield tapped.

Indestructible

{T}: Add {R} or {W}.

({T}: Add {R} or {W}.)

As Sacred Foundry enters the battlefield, you may pay 2 life. If you don't, it enters the battlefield tapped.

Whenever you cast an artifact spell, create a 1/1 colorless Thopter artifact creature token with flying.

{1}{U}, Sacrifice two artifacts: Draw a card.

{T}, Pay 1 life, Sacrifice Scalding Tarn: Search your library for an Island or Mountain card, put it onto the battlefield, then shuffle.

Squad {3} (As an additional cost to cast this spell, you may pay {3} any number of times. When this creature enters the battlefield, create that many tokens that are copies of it.)

Vigilance

Whenever a creature token enters the battlefield under your control, put a +1/+1 counter on it.

Haste

As long as an artifact entered the battlefield under your control this turn, creatures you control get +2/+2.

Battalion -- Whenever Sentinel Sarah Lyons and at least two other creatures attack, Sentinel Sarah Lyons deals damage equal to the number of artifacts you control to target player.

Silverbluff Bridge enters the battlefield tapped.

Indestructible

{T}: Add {U} or {R}.

Equipped creature gets +1/-1.

Whenever equipped creature dies, draw two cards.

Equip {1}

{1}, {T}: Add {W}{U}.

Whenever an opponent draws a card, that player may pay {2}. If the player doesn't, you create a Treasure token. (It's an artifact with "{T}, Sacrifice this artifact: Add one mana of any color.")

({T}: Add {U} or {R}.)

As Steam Vents enters the battlefield, you may pay 2 life. If you don't, it enters the battlefield tapped.

{T}: Put a +1/+1 counter on each artifact creature you control.

As Struggle for Project Purity enters the battlefield, choose Brotherhood or Enclave.

• Brotherhood -- At the beginning of your upkeep, each opponent draws a card. You draw a card for each card drawn this way.

• Enclave -- Whenever a player attacks you with one or more creatures, that player gets twice that many rad counters.

Sulfur Falls enters the battlefield tapped unless you control an Island or a Mountain.

{T}: Add {U} or {R}.

{1}, {T}: Add {R}{W}.

Exile target creature. Its controller gains life equal to its power.

Haste

Whenever Synth Eradicator attacks, exile the top card of your library. You may get {E}{E} (two energy counters). If you don't, you may play that card this turn.

{T}, Pay {E}{E}{E}: Synth Eradicator deals 3 damage to any target.

Artifact creatures you control get +2/+2.

{T}: Add {C}.

{1}, {T}: Add one mana of any color.

{X}, {T}: The Mycosynth Gardens becomes a copy of target nontoken artifact you control with mana value X.

Indestructible

When The One Ring enters the battlefield, if you cast it, you gain protection from everything until your next turn.

At the beginning of your upkeep, you lose 1 life for each burden counter on The One Ring.

{T}: Put a burden counter on The One Ring, then draw a card for each burden counter on The One Ring.

At the beginning of your upkeep, if you control an artifact, create a 1/1 colorless Thopter artifact creature token with flying.

Whenever one or more artifact creatures you control deal combat damage to a player, draw a card.

Artifact creatures you control get +2/+2.

{6}: Create a token that's a copy of target artifact you control, except it's a 1/1 Soldier creature in addition to its other types.

When Whirler Virtuoso enters the battlefield, you get {E}{E}{E} (three energy counters).

Pay {E}{E}{E}: Create a 1/1 colorless Thopter artifact creature token with flying.