As Arcane Adaptation enters the battlefield, choose a creature type.

Creatures you control are the chosen type in addition to their other types. The same is true for creature spells you control and creature cards you own that aren't on the battlefield.

Flying

When Augury Owl enters the battlefield, scry 3. (Look at the top three cards of your library, then put any number of them on the bottom of your library and the rest on top in any order.)

Flying, deathtouch

When Baleful Strix enters the battlefield, draw a card.

({2/B} can be paid with any two mana or with {B}. This card's mana value is 6.)

Search your library for a card with mana value less than or equal to the number of lands you control, reveal it, put it into your hand, then shuffle.

Whenever a creature you control deals combat damage to a player, you may draw a card.

{1}{U}, {T}: Creatures your opponents control attack this turn if able.

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

Draw three cards, then put two cards from your hand on top of your library in any order.

As Choked Estuary enters the battlefield, you may reveal an Island or Swamp card from your hand. If you don't, Choked Estuary enters the battlefield tapped.

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

Flying

When Cloud of Faeries enters the battlefield, untap up to two lands.

Cycling {2} ({2}, Discard this card: Draw a card.)

Flying

Evolve (Whenever a creature enters the battlefield under your control, if that creature has greater power or toughness than this creature, put a +1/+1 counter on this creature.)

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

Put target spell or nonland permanent into its owner's library second from the top.

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Aftermath (Cast this spell only from your graveyard. Then exile it.)

Each player shuffles their hand and graveyard into their library, then draws seven cards.

Gain control of target creature with power 2 or less.

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Surveil 3, then return a creature card from your graveyard to the battlefield.

Return target nonland permanent to its owner's hand.

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Aftermath (Cast this spell only from your graveyard. Then exile it.)

Target opponent discards two cards.

Counter target spell.

Creeping Tar Pit enters the battlefield tapped.

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

{1}{U}{B}: Creeping Tar Pit becomes a 3/2 blue and black Elemental creature until end of turn and can't be blocked this turn. It's still a land.

Undaunted (This spell costs {1} less to cast for each opponent.)

Destroy two target creatures.

Destroy all creatures. They can't be regenerated. Draw a card for each creature destroyed this way.

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

When you cycle Decree of Pain, all creatures get -2/-2 until end of turn.

Search your library for a card, put that card into your hand, then shuffle.

Dimir Infiltrator can't be blocked.

Transmute {1}{U}{B} ({1}{U}{B}, Discard this card: Search your library for a card with the same mana value as this card, reveal it, put it into your hand, then shuffle. Transmute only as a sorcery.)

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

{U}{B}: Dimir Keyrune becomes a 2/2 blue and black Horror artifact creature until end of turn and can't be blocked this turn.

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

Surveil 2, then draw a card. (To surveil 2, look at the top two cards of your library, then put any number of them into your graveyard and the rest on top of your library in any order.)

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Each opponent returns a nonland permanent they control with the highest mana value among permanents they control to its owner's hand, then discards a card.

When Dowsing Dagger enters the battlefield, target opponent creates two 0/2 green Plant creature tokens with defender.

Equipped creature gets +2/+1.

Whenever equipped creature deals combat damage to a player, you may transform Dowsing Dagger.

Equip {2}

(Transforms from Dowsing Dagger.)

{T}: Add three mana of any one color.

Drowned Catacomb enters the battlefield tapped unless you control an Island or a Swamp.

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

Return all creatures to their owners' hands.

Faerie Conclave enters the battlefield tapped.

{T}: Add {U}.

{1}{U}: Faerie Conclave becomes a 2/1 blue Faerie creature with flying until end of turn. It's still a land.

Return target creature to its owner's hand.

Fuse (You may cast one or both halves of this card from your hand.)

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Target player sacrifices a creature.

Fuse (You may cast one or both halves of this card from your hand.)

{T}: Add one mana of any color that a land an opponent controls could produce.

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

Fetid Pools enters the battlefield tapped.

Cycling {2} ({2}, Discard this card: Draw a card.)

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

Gudul Lurker can't be blocked.

Megamorph {U} (You may cast this card face down as a 2/2 creature for {3}. Turn it face up any time for its megamorph cost and put a +1/+1 counter on it.)

Halimar Depths enters the battlefield tapped.

When Halimar Depths enters the battlefield, look at the top three cards of your library, then put them back in any order.

{T}: Add {U}.

Flying

Sacrifice Hope of Ghirapur: Until your next turn, target player who was dealt combat damage by Hope of Ghirapur this turn can't cast noncreature spells.

Bestow {5}{U}{U} (If you cast this card for its bestow cost, it's an Aura spell with enchant creature. It becomes a creature again if it's not attached to a creature.)

Flying

You control enchanted creature.

Enchanted creature gets +1/+1 and has flying.

Destroy all creatures you don't control and all planeswalkers you don't control.

Inkfathom Infiltrator can't block and can't be blocked.

Fear (This creature can't be blocked except by artifact creatures and/or black creatures.)

{2}{U}{B}: Each unblocked creature has base power and toughness 4/1 until end of turn.

Hexproof (This creature can't be the target of spells or abilities your opponents control.)

Invisible Stalker can't be blocked.

({T}: Add {U}.)

({T}: Add {U}.)

({T}: Add {U}.)

({T}: Add {U}.)

({T}: Add {U}.)

({T}: Add {U}.)

({T}: Add {U}.)

({T}: Add {U}.)

({T}: Add {U}.)

Flying

Jace's Phantasm gets +4/+4 as long as an opponent has ten or more cards in their graveyard.

Whenever a creature you control deals combat damage to a player, that player discards a card.

Shadow (This creature can block or be blocked by only creatures with shadow.)

Whenever Looter il-Kor deals damage to an opponent, draw a card, then discard a card.

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

Flying

Whenever another Spirit enters the battlefield under your control, Mausoleum Wanderer gets +1/+1 until end of turn.

Sacrifice Mausoleum Wanderer: Counter target instant or sorcery spell unless its controller pays {X}, where X is Mausoleum Wanderer's power.

Mist-Cloaked Herald can't be blocked.

Ninjutsu {U} ({U}, Return an unblocked attacker you control to hand: Put this card onto the battlefield from your hand tapped and attacking.)

Whenever Mistblade Shinobi deals combat damage to a player, you may return target creature that player controls to its owner's hand.

Changeling (This card is every creature type.)

Tap an untapped creature you control: Mothdust Changeling gains flying until end of turn.

Counter target instant or sorcery spell.

Transmute {1}{U}{U} ({1}{U}{U}, Discard this card: Search your library for a card with the same mana value as this card, reveal it, put it into your hand, then shuffle. Transmute only as a sorcery.)

{T}: Add {C}.

{1}: Mutavault becomes a 2/2 creature with all creature types until end of turn. It's still a land.

Counter target noncreature spell.

Flying

Whenever Nightveil Sprite attacks, surveil 1. (Look at the top card of your library. You may put it into your graveyard.)

Ninjutsu {1}{U} ({1}{U}, Return an unblocked attacker you control to hand: Put this card onto the battlefield from your hand tapped and attacking.)

Whenever Ninja of the Deep Hours deals combat damage to a player, you may draw a card.

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.)

At the beginning of your upkeep, you draw a card and you lose 1 life.

Look at the top three cards of your library, then put them back in any order. You may shuffle.

Draw a card.

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

Equipped creature has deathtouch.

Whenever equipped creature deals combat damage to a player, that player loses half their life, rounded up.

Equip {3}

All creatures get -2/-2 until end of turn.

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Aftermath (Cast this spell only from your graveyard. Then exile it.)

Each opponent chooses a creature they control. You gain control of those creatures.

You have no maximum hand size.

{T}: Add {C}.

Flying

When Sage Owl enters the battlefield, look at the top four cards of your library, then put them back in any order.

Ninjutsu {4}{U}{B} ({4}{U}{B}, Return an unblocked attacker you control to hand: Put this card onto the battlefield from your hand tapped and attacking.)

Whenever Silent-Blade Oni deals combat damage to a player, look at that player's hand. You may cast a spell from among those cards without paying its mana cost.

Flying

{U}, Sacrifice Siren Stormtamer: Counter target spell or ability that targets you or a creature you control.

Slither Blade can't be blocked.

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

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

Sunken Hollow enters the battlefield tapped unless you control two or more basic lands.

({T}: Add {B}.)

({T}: Add {B}.)

({T}: Add {B}.)

({T}: Add {B}.)

({T}: Add {B}.)

({T}: Add {B}.)

Counter target enchantment, instant, or sorcery spell. Its controller creates a 2/2 blue Bird creature token with flying.

Equipped creature gets +1/+1.

Whenever equipped creature attacks, you may search your library for a basic land card, put it onto the battlefield tapped, then shuffle.

Equip {2}

{T}: Add {C}.

{T}: Add {U} or {B}. Talisman of Dominance deals 1 damage to you.

Look at the top three cards of your library. Put one of those cards into your hand, one on top of your library, and one on the bottom of your library.

Delve (Each card you exile from your graveyard while casting this spell pays for {1}.)

Take an extra turn after this one. Exile Temporal Trespass.

Creatures you control with power or toughness 1 or less can't be blocked.

Shadow (This creature can block or be blocked by only creatures with shadow.)

When Thalakos Seer leaves the battlefield, draw a card.

Flying

Whenever Thief of Sanity deals combat damage to a player, look at the top three cards of that player's library, exile one of them face down, then put the rest into their graveyard. You may cast that card for as long as it remains exiled, and mana of any type can be spent to cast it.

You have no maximum hand size.

{T}: Add {C}.

At the beginning of your end step, each opponent loses life equal to the number of tapped creatures you control.

Tormented Soul can't block and can't be blocked.

Triton Shorestalker can't be blocked.

{T}: Add {C}.

{T}: Add {U} or {B}. Underground River deals 1 damage to you.

{1}: Choose a creature type other than Wall. Target creature becomes that type until end of turn.

Each land is a Swamp in addition to its other land types.

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

Flying

Lifelink (Damage dealt by this creature also causes you to gain that much life.)

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

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

Skulk (This creature can't be blocked by creatures with greater power.)

Whenever Wharf Infiltrator deals combat damage to a player, you may draw a card. If you do, discard a card.

Whenever you discard a creature card, you may pay {2}. If you do, create a 3/2 colorless Eldrazi Horror creature token.

As Xenograft enters the battlefield, choose a creature type.

Each creature you control is the chosen type in addition to its other types.

Commander ninjutsu {U}{B} ({U}{B}, Return an unblocked attacker you control to hand: Put this card onto the battlefield from your hand or the command zone tapped and attacking.)

Whenever a Ninja you control deals combat damage to a player, reveal the top card of your library and put that card into your hand. Each opponent loses life equal to that card's mana value.