Other artifact creatures you control have haste.

Whenever one or more artifact creatures you control attack, Alibou, Ancient Witness deals X damage to any target and you scry X, where X is the number of tapped artifacts you control.

{T}: Add one mana of any color.

At the beginning of your precombat main phase, add {B} for each charge counter on Altar of Shadows.

{7}, {T}: Destroy target creature. Then put a charge counter on Altar of Shadows.

Astral Cornucopia enters the battlefield with X charge counters on it.

{T}: Choose a color. Add one mana of that color for each charge counter on Astral Cornucopia.

Whenever a creature dies, put a charge counter on Black Market.

At the beginning of your precombat main phase, add {B} for each charge counter on Black Market.

Double strike

Ward {2} (Whenever this creature becomes the target of a spell or ability an opponent controls, counter it unless that player pays {2}.)

Other artifacts you control have ward {2}.

Bronze Guardian's power is equal to the number of artifacts you control.

Creature tokens you control have haste.

At the beginning of combat on your turn, create a 2/1 blue Phyrexian Myr artifact creature token. Then you may choose a token you control. If you do, each other token you control becomes a copy of that token.

{T}: Add {G}.

{T}: Put a charge counter on target artifact.

Sacrifice Coretapper: Put two charge counters on target artifact.

Indestructible (Damage and effects that say "destroy" don't destroy this creature. If its toughness is 0 or less, it's still put into its owner's graveyard.)

Indestructible (Effects that say "destroy" don't destroy this artifact.)

At the beginning of your upkeep, you may put a charge counter on Darksteel Reactor.

When Darksteel Reactor has twenty or more charge counters on it, you win the game.

As Door of Destinies enters the battlefield, choose a creature type.

Whenever you cast a spell of the chosen type, put a charge counter on Door of Destinies.

Creatures you control of the chosen type get +1/+1 for each charge counter on Door of Destinies.

Empowered Autogenerator enters the battlefield tapped.

{T}: Put a charge counter on Empowered Autogenerator. Add X mana of any one color, where X is the number of charge counters on Empowered Autogenerator.

At the beginning of your upkeep, choose one --

• Put a +1/+1 counter on target artifact creature.

• Put a charge counter on target noncreature artifact.

Multikicker {2} (You may pay an additional {2} any number of times as you cast this spell.)

Everflowing Chalice enters the battlefield with a charge counter on it for each time it was kicked.

{T}: Add {C} for each charge counter on Everflowing Chalice.

Whenever a nontoken creature enters the battlefield, if Genesis Chamber is untapped, that creature's controller creates a 1/1 colorless Myr artifact creature token.

{T}: Add {W}.

Whenever you cast an artifact spell, you may put a charge counter on Golem Foundry.

Remove three charge counters from Golem Foundry: Create a 3/3 colorless Golem artifact creature token.

Flying, vigilance

Infect (This creature deals damage to creatures in the form of -1/-1 counters and to players in the form of poison counters.)

Whenever Ichorclaw Myr becomes blocked, it gets +2/+2 until end of turn.

{1}{R}, Remove a +1/+1 counter or a charge counter from a permanent you control: Ion Storm deals 2 damage to any target.

{T}: Add {R}.

{2}{W}: Adapt 1. (If this creature has no +1/+1 counters on it, put a +1/+1 counter on it.)

Whenever one or more +1/+1 counters are put on Knighted Myr, it gains double strike until end of turn.

{T}: Add {B}.

Trample

Tap an untapped artifact you control: Lodestone Myr gets +1/+1 until end of turn.

{T}: Put a charge counter on Lux Cannon.

{T}, Remove three charge counters from Lux Cannon: Destroy target permanent.

{4}, {T}: Put a charge counter on Magistrate's Scepter.

{T}, Remove three charge counters from Magistrate's Scepter: Take an extra turn after this one.

Create two 1/1 colorless Myr artifact creature tokens.

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.

When Myr Battlesphere enters the battlefield, create four 1/1 colorless Myr artifact creature tokens.

Whenever Myr Battlesphere attacks, you may tap X untapped Myr you control. If you do, Myr Battlesphere gets +X/+0 until end of turn and deals X damage to the player or planeswalker it's attacking.

Toxic 1 (Players dealt combat damage by this creature also get a poison counter.)

{T}, Pay 2 life: Add one mana of any color.

Other Myr creatures you control get +1/+1.

{1}, {T}: Untap each other Myr you control.

{6}, {T}, Sacrifice Myr Incubator: Search your library for any number of artifact cards, exile them, then create that many 1/1 colorless Myr artifact creature tokens. Then shuffle.

When Myr Kinsmith enters the battlefield, you may search your library for a Myr card, reveal it, put it into your hand, then shuffle.

Indestructible (Effects that say "destroy" don't destroy this artifact.)

Myr creatures get +1/+1.

{5}: Create a 1/1 colorless Myr artifact creature token.

When Myr Moonvessel dies, add {C}.

{3}, {T}: Create a token that's a copy of Myr Propagator.

{T}: Add {C}{C}. Spend this mana only to cast Myr spells or activate abilities of Myr.

{3}, {T}: Return target Myr card from your graveyard to your hand.

When Myr Retriever dies, return another target artifact card from your graveyard to your hand.

When Myr Sire dies, create a 1/1 colorless Phyrexian Myr artifact creature token.

Spend only mana produced by creatures to cast this spell.

{T}: Create a 1/1 colorless Myr artifact creature token.

{T}, Tap five untapped Myr you control: Search your library for a Myr creature card, put it onto the battlefield, then shuffle.

Imprint -- {T}: Exile target artifact card from a graveyard.

Myr Welder has all activated abilities of all cards exiled with it.

{T}: Put a charge counter on Otherworld Atlas.

{T}: Each player draws a card for each charge counter on Otherworld Atlas.

{T}: Add {C}{C}.

Enchant creature

At the beginning of your upkeep, enchanted creature's controller sacrifices it and you create a 1/1 colorless Phyrexian Myr artifact creature token.

{2}, Sacrifice Parcel Myr: Draw a card.

When Perilous Myr dies, it deals 2 damage to any target.

Infect (This creature deals damage to creatures in the form of -1/-1 counters and to players in the form of poison counters.)

{T}: Add {C}.

Flash

You may cast artifact spells as though they had flash.

At the beginning of your upkeep or whenever you cast a white spell, put a charge counter on Shrine of Loyal Legions.

{3}, {T}, Sacrifice Shrine of Loyal Legions: Create a 1/1 colorless Phyrexian Myr artifact creature token for each charge counter on Shrine of Loyal Legions.

{T}: Add {U}.

Sunburst (This enters the battlefield with a +1/+1 counter on it for each color of mana spent to cast it.)

When The Mightstone and Weakstone enters the battlefield, choose one --

• Draw two cards.

• Target creature gets -5/-5 until end of turn.

{T}: Add {C}{C}. This mana can't be spent to cast nonartifact spells.

(Melds with Urza, Lord Protector.)

{3}, {T}: Put a charge counter on Titan Forge.

{T}, Remove three charge counters from Titan Forge: Create a 9/9 colorless Golem artifact creature token.

Artifact, instant, and sorcery spells you cast cost {1} less to cast.

{7}: If you both own and control Urza, Lord Protector and an artifact named The Mightstone and Weakstone, exile them, then meld them into Urza, Planeswalker. Activate only as a sorcery.