Whenever you cast a blue spell, exile the top card of target player's library.

Whenever you cast a black spell, exile the top card of target player's library.

Your opponents can't cast spells with the same name as a card exiled with Circu, Dimir Lobotomist.

At the beginning of each player's end step, Citadel of Pain deals X damage to that player, where X is the number of untapped lands they control.

Whenever an opponent casts an artifact spell, put a +1/+1 counter on Citanul Druid.

Creatures you control have ": Add ."

Whenever one or more other nontoken permanents with a name originally printed in the Arabian Nights expansion are on the battlefield, their controllers sacrifice them.

Players can't cast spells or play lands with a name originally printed in the Arabian Nights expansion.

Whenever City of Brass becomes tapped, it deals 1 damage to you.

: Add one mana of any color.

Players can cast spells and activate abilities only during their own turns.

, : Target creature gets +0/+1 until end of turn.

, : Put target creature you control on top of its owner's library.

When Civic Wayfinder enters, you may search your library for a basic land card, reveal it, put it into your hand, then shuffle.

Enchant creature

Enchanted creature has ", : Target player loses 2 life."

As Clam Session enters, choose a word.

At the beginning of your upkeep, you may sing at least six words of a song, at least one of which is the chosen word. If you don't, sacrifice Clam Session. You can't repeat a song.

If you roll a 3 on a six-sided die, you may reroll that die.

Choose five permanents you control. For each of those permanents, you may search your library for a card with the same name as that permanent. Put those cards onto the battlefield tapped, then shuffle.

Enchant creature

When Claustrophobia enters, tap enchanted creature.

Enchanted creature doesn't untap during its controller's untap step.

Enchant creature

Enchanted creature gets +1/+0 for each Mountain you control and has first strike.

Flying

, Throw Clay Pigeon into the air at least two feet above your head while seated: If you catch Clay Pigeon with one hand, prevent all damage a source of your choice would deal to you this turn and tap Clay Pigeon. Otherwise, sacrifice it.

Destroy all enchantments.

For each land, destroy that land unless any player pays 1 life.

Destroy all enchantments.

Threshold — If seven or more cards are in your graveyard, instead destroy all enchantments, then return all cards in your graveyard destroyed this way to the battlefield.

Destroy target creature with defender.

Sunburst (This enters with a charge counter on it for each color of mana spent to cast it.)

At the beginning of your upkeep, you may gain life equal to the number of charge counters on Clearwater Goblet.

: Prevent the next 1 damage that would be dealt to any target this turn.

Haste

Sacrifice a Goblin: Clickslither gets +2/+2 and gains trample until end of turn.

Cliffrunner Behemoth has haste as long as you control a red permanent.

Cliffrunner Behemoth has lifelink as long as you control a white permanent.

Defender

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

Prevent all combat damage that would be dealt this turn.

Fateful hour — If you have 5 or less life, tap all attacking creatures. Those creatures don't untap during their controller's next untap step.

Enchant creature you control

Whenever enchanted creature attacks and isn't blocked, you may have it assign no combat damage this turn. If you do, defending player discards a card at random.

Enchant creature

Enchanted creature has phasing and can't be blocked except by Walls. (It phases in or out before its controller untaps during each of their untap steps. While it's phased out, it's treated as though it doesn't exist.)

Flash (You may cast this spell any time you could cast an instant.)

Flying

Buyback (You may pay an additional as you cast this spell. If you do, put this card into your hand as it resolves.)

Choose a counter on target permanent or suspended card. Remove that counter from that permanent or card or put another of those counters on it.

Clockwork Beast enters with seven +1/+0 counters on it.

At end of combat, if Clockwork Beast attacked or blocked this combat, remove a +1/+0 counter from it.

, : Put up to X +1/+0 counters on Clockwork Beast. This ability can't cause the total number of +1/+0 counters on Clockwork Beast to be greater than seven. Activate only during your upkeep.

Flying

Clockwork Condor enters with three +1/+1 counters on it.

Whenever Clockwork Condor attacks or blocks, remove a +1/+1 counter from it at end of combat.

, : Regenerate target artifact creature.

Clockwork Steed enters with four +1/+0 counters on it.

Clockwork Steed can't be blocked by artifact creatures.

At end of combat, if Clockwork Steed attacked or blocked this combat, remove a +1/+0 counter from it.

, : Put up to X +1/+0 counters on Clockwork Steed. This ability can't cause the total number of +1/+0 counters on Clockwork Steed to be greater than four. Activate only during your upkeep.

Trample

Clockwork Vorrac enters with four +1/+1 counters on it.

Whenever Clockwork Vorrac attacks or blocks, remove a +1/+1 counter from it at end of combat.

: Put a +1/+1 counter on Clockwork Vorrac.

You may have Clone enter as a copy of any creature on the battlefield.

Whenever a creature you control becomes blocked, Close Quarters deals 1 damage to any target.

Whenever another permanent you control becomes the target of a spell or ability an opponent controls, you may return that permanent to its owner's hand.

Flying

Cloud Djinn can block only creatures with flying.

Flying

Cloud Elemental can block only creatures with flying.

Flying

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

Cycling (, Discard this card: Draw a card.)

Flying

Cloud Spirit can block only creatures with flying.

Flying

When Cloudchaser Eagle enters, destroy target enchantment.

: Add .

: Add or . Cloudcrest Lake doesn't untap during your next untap step.

Flying

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

Flying

: Cloudheath Drake gains vigilance until end of turn.

Cloudpost enters tapped.

: Add for each Locus on the battlefield.

Flying

, , Discard a card: Create a 1/1 blue Faerie creature token named Cloud Sprite. It has flying and "Cloud Sprite can block only creatures with flying."

Flying

Fading 3 <I>(This creature enters with three fade counters on it. At the beginning of your upkeep, remove a fade counter from it. If you can't, sacrifice it.)</I>

Flash

Reach

When Cloudthresher enters, it deals 2 damage to each creature with flying and each player.

Evoke (You may cast this spell for its evoke cost. If you do, it's sacrificed when it enters.)