Coram, the Undertaker gets +X/+0, where X is the greatest power among creature cards in all graveyards.

Whenever Coram attacks, each player mills a card.

During each of your turns, you may play a land and cast a spell from among cards in graveyards that were put there from libraries this turn.

When Cornered Crook enters the battlefield, you may sacrifice an artifact. When you do, Cornered Crook deals 3 damage to any target.

Defender

Sacrifice another creature: Corpse Blockade gains deathtouch until end of turn.

, Sacrifice a creature: Target opponent reveals their hand. You choose a card from it. That player discards that card. Activate only as a sorcery.

Enchant creature

You control enchanted creature.

Enchanted creature has infect. (It deals damage to creatures in the form of -1/-1 counters and to players in the form of poison counters.)

: Add . ( represents colorless mana.)

, Pay 1 life: Add one mana of any color. Spend this mana only to cast a spell with devoid.

, Sacrifice a creature: Regenerate Corrupted Harvester.

Counter target spell if its controller is poisoned.

Devoid (This card has no color.)

As Corrupted Shapeshifter enters the battlefield, it becomes your choice of a 3/3 creature with flying, a 2/5 creature with vigilance, or a 0/12 creature with defender.

, : Corrupting Licid loses this ability and becomes an Aura enchantment with enchant creature. Attach it to target creature. You may pay to end this effect.

Enchanted creature has fear. (It can't be blocked except by artifact creatures and/or black creatures.)

As an additional cost to cast this spell, sacrifice an artifact or creature.

Draw two cards.

Will of the council — When Council Guardian enters the battlefield, starting with you, each player votes for blue, black, red, or green. Council Guardian gains protection from each color with the most votes or tied for most votes.

Draw a card.

Whenever you scry, if you control an Island, you may exile Council's Deliberation from your graveyard. If you do, draw a card.

Counter target spell. Its controller mills four cards.

Revolt — When Countless Gears Renegade enters the battlefield, if a permanent you controlled left the battlefield this turn, create a 1/1 colorless Servo artifact creature token.

When Courageous Outrider enters the battlefield, look at the top four cards of your library. You may reveal a Human card from among them and put it into your hand. Put the rest on the bottom of your library in any order.

When Court of Ardenvale enters the battlefield, you become the monarch.

At the beginning of your upkeep, return target permanent card with mana value 3 or less from your graveyard to your hand. If you're the monarch, return that permanent card to the battlefield instead.

Convoke (Your creatures can help cast this spell. Each creature you tap while casting this spell pays for or one mana of that creature's color.)

Covenant of Blood deals 4 damage to any target and you gain 4 life.

As Cover of Darkness enters the battlefield, choose a creature type.

Creatures of the chosen type have fear. (They can't be blocked except by artifact creatures and/or black creatures.)

Flying

Whenever Coveted Falcon attacks, gain control of target permanent you own but don't control.

Disguise

When Coveted Falcon is turned face up, target opponent gains control of any number of target permanents you control. Draw a card for each one they gained control of this way.

Flying

Whenever Coveted Peacock attacks, you may goad target creature defending player controls. (Until your next turn, that creature attacks each combat if able and attacks a player other than you if able.)

Flying

When you control no artifacts, sacrifice Covetous Dragon.

Whenever a creature becomes the target of a spell or ability, return that creature to its owner's hand. (It won't be affected by the spell or ability.)

Nonwhite creatures with power 3 or greater don't untap during their controllers' untap steps.

Crackling Doom deals 2 damage to each opponent. Each opponent sacrifices a creature with the greatest power among creatures that player controls.

: Add an amount of equal to Cradle Clearcutter's power.

//PRT-Prototype_Mech//

Prototype (You may cast this spell with different mana cost, color, and size. It keeps its abilities and types.)

1/3

Flash

Enchant creature you control

When Cradle of Safety enters the battlefield, enchanted creature gains hexproof until end of turn. (It can't be the target of spells or abilities your opponents control.)

Enchanted creature gets +1/+1.

Whenever you gain life, you may pay . If you do, put a +1/+1 counter on target creature for each 1 life you gained.

Reach, lifelink

One for My Baby — Whenever you attack with two or more creatures, put two quest counters on Craig Boone, Novac Guard. When you do, Craig Boone deals damage equal to the number of quest counters on it to up to one target creature unless that creature's controller has Craig Boone deal that much damage to them.

Target creature with flying loses flying until end of turn. Crash Landing deals damage to that creature equal to the number of Forests you control.

This spell has flash as long as you control a Merfolk.

Return target creature to its owner's hand.

Draw a card.

When Crazed Firecat enters the battlefield, flip a coin until you lose a flip. Put a +1/+1 counter on Crazed Firecat for each flip you won.

Flying, haste

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

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

At the beginning of your upkeep, you may create a 1/1 black and green Worm creature token.

, , Sacrifice Credit Voucher: Shuffle any number of cards from your hand into your library, then draw that many cards.

At the beginning of your upkeep, each player discards a card. Each opponent who discarded a card that shares a card type with the card you discarded loses 3 life. (Players reveal the discarded cards simultaneously.)

Indestructible

Whenever Creepy Doll deals combat damage to a creature, flip a coin. If you win the flip, destroy that creature.

At the beginning of each upkeep, put a strife counter on Crescendo of War.

Attacking creatures get +1/+0 for each strife counter on Crescendo of War.

Blocking creatures you control get +1/+0 for each strife counter on Crescendo of War.

Trample

When Crested Herdcaller enters the battlefield, create a 3/3 green Dinosaur creature token with trample.

Trample

When Crimson Fleet Commodore enters the battlefield, you become the monarch.

Croakid Amphibonaut has flying as long as you control a stickered permanent.

, : Exile target card from a graveyard.

, Exile Crook of Condemnation: Exile all graveyards.

Crooked Custodian enters the battlefield tapped.

When Crossroads Candleguide enters the battlefield, exile up to one target card from a graveyard.

: Add one mana of any color.

Creatures with flying get -2/-0.

Other white creatures get +1/+1.

Nonwhite creatures get -1/-1.

Pay 2 life: Return Crovax, Ascendant Hero to its owner's hand.

: Tap target creature.

: Crowd Favorites gets +0/+5 until end of turn.

As Crowd-Control Warden enters the battlefield or is turned face up, put X +1/+1 counters on it, where X is the number of other creatures you control.

Disguise (You may cast this card face down for as a 2/2 creature with ward . Turn it face up any time for its disguise cost.)