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When Corridor Monitor enters, untap target artifact or creature you control.

Whenever Corrosive Ooze blocks or becomes blocked by an equipped creature, destroy all Equipment attached to that creature at end of combat.

Corrupt deals damage to any target equal to the number of Swamps you control. You gain life equal to the damage dealt this way.

When Corrupt Court Official enters, target opponent discards a card.

As an additional cost to cast this spell, sacrifice a creature.
Draw two cards.

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

When Corruption of Towashi enters, incubate 4.
Whenever a permanent you control transforms or a permanent you control enters transformed, you may draw a card. Do this only once each turn.

When Corsair Captain enters, create a Treasure token.
Other Pirates you control get +1/+1.

Offspring {2}
Whenever you cast a noncreature spell, this creature deals 1 damage to each opponent.

At the beginning of your upkeep, you may exile Cosima. If you do, it gains "Whenever a land you control enters, if Cosima is exiled, you may put a voyage counter on it. If you don't, return Cosima to the battlefield with X +1/+1 counters on it and draw X cards, where X is the number of voyage counters on it."

Draw cards equal to the number of instant and sorcery cards in your graveyard.

Target creature you control deals damage equal to its power to another target creature, planeswalker, or battle.

Choose target permanent card in your graveyard. If it has mana value 3 or less, you may put it onto the battlefield. If you don't put it onto the battlefield, put it into your hand.
You gain 3 life.

Cosmium Blast deals 4 damage to target attacking or blocking creature.

Choose three. You may choose the same mode more than once.
• Search your library for a Cave card, put it onto the battlefield tapped, then shuffle.
• Put three +1/+1 counters on a Cave you control. It becomes a 0/0 Elemental creature with haste. It's still a land.
• Destroy target enchantment.

When Cosmium Kiln enters, create two 1/1 colorless Gnome artifact creature tokens.
Creatures you control get +1/+1.

Flash
Flying
Foretelling cards from your hand costs {1} less and can be done on any player's turn.
Foretell {2}{U}

Flash
Flying
Foretelling cards from your hand costs {1} less and can be done on any player's turn.
Foretell {U}

At the beginning of your end step, draw a card if your life total is greater than your starting life total. Otherwise, you gain 2 life.

At the beginning of your end step, draw a card if your life total is greater than your starting life total. Otherwise, you gain 2 life and scry 1.

Cosmotronic Wave deals 1 damage to each creature your opponents control. Creatures your opponents control can't block this turn.

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

When Cottontail Caretaker enters, choose a white creature card in your hand. That card perpetually gains offspring {1}.

Flying
Descend 4 — When Council of Echoes enters, if there are four or more permanent cards in your graveyard, return up to one target nonland permanent other than Council of Echoes to its owner's hand.

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.