: The next time a red source of your choice would deal damage to you this turn, prevent that damage.

: The next time a white source of your choice would deal damage to you this turn, prevent that damage.

Bear Form — During your turn, Circle of the Moon Druid is a Bear with base power and toughness 4/2. (It loses all other creature types.)

Counter target spell unless its controller pays for each card in your graveyard.

Madness (If you discard this card, discard it into exile. When you do, cast it for its madness cost or put it into your graveyard.)

Citadel Gate enters tapped.

As Citadel Gate enters, choose a color other than white.

: Add or one mana of the chosen color.

, Tap an untapped artifact or creature you control: Add one mana of any color.

When Citizen's Arrest enters, exile target creature or planeswalker an opponent controls until Citizen's Arrest leaves the battlefield.

, : 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."

Look at target player's hand.

Draw a card at the beginning of the next turn's upkeep.

Whenever Clambassadors deals damage to a player, choose an artifact, creature, or land you control. That player gains control of that permanent.

Whenever Clammy Prowler attacks, another target attacking creature can't be blocked this turn.

When Clattering Skeletons dies, venture into the dungeon. (Enter the first room or advance to the next room.)

Enchant artifact or creature

As long as enchanted permanent is a creature, it gets -1/-1 and can't block.

Enchanted permanent has "At the beginning of your upkeep, you lose 1 life."

Claws of Wirewood deals 3 damage to each creature with flying and each player.

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

: Regenerate Clay Statue.

Cleansing Screech deals 4 damage to any target.

Destroy target creature with defender.

Target player shuffles their graveyard into their library.

Draw a card.

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

Whenever Cleric of Chill Depths blocks a creature, that creature doesn't untap during its controller's next untap step.

Mage Hand — : Untap target permanent not named Clever Conjurer. Activate only as a sorcery.

Cliffgate enters tapped.

As Cliffgate enters, choose a color other than red.

: Add or one mana of the chosen color.

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.)

Equipped creature has flying and haste.

Equip (: Attach to target creature you control. Equip only as a sorcery.)

Gathered Swarm — Whenever one or more tokens you control enter, put a +1/+1 counter on Cloakwood Swarmkeeper.

Clockwork Beetle enters with two +1/+1 counters on it.

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

Defender

, : Tap target creature.

, : 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.

All Slivers have ": Regenerate this permanent."

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.

Reach (This creature can block creatures with flying.)

Flying

: Cloudheath Drake gains vigilance until end of turn.

Mutate (If you cast this spell for its mutate cost, put it over or under target non-Human creature you own. They mutate into the creature on top plus all abilities from under it.)

Reach

Whenever this creature mutates, you may discard a card. If you do, draw a card.

Flying

When Cloudreader Sphinx enters, scry 2. (Look at the top two cards of your library, then put any number of them on the bottom and the rest on top in any order.)

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>

Visit — Create a 1/1 white Clown Robot artifact creature token.

Lights — 2, 6

Visit — Create a 1/1 white Clown Robot artifact creature token.

Lights — 4, 6

Create two 1/1 white Clown Robot artifact creature tokens, then roll a six-sided die. If the result is equal to or less than the number of Robots you control, create a 1/1 white Clown Robot artifact creature token.

Enchant creature

Enchanted creature gets +3/+3 as long as it's a Zombie. Otherwise, it gets -3/-3.

When Coal Stoker enters, if you cast it from your hand, add .