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When Consul's Shieldguard enters the battlefield, you get {E}{E}.
Whenever Consul's Shieldguard attacks, you may pay {E}. If you do, another target attacking creature gains indestructible until end of turn.

When Consulate Crackdown enters the battlefield, exile all artifacts your opponents control until Consulate Crackdown leaves the battlefield.

When Consulate Surveillance enters the battlefield, you get {E}{E}{E}{E}.
Pay {E}{E}: Prevent all damage that would be dealt to you this turn by a source of your choice.

When Contagion Clasp enters the battlefield, put a -1/-1 counter on target creature.
{4}, {T}: Proliferate.

When Contagion Dispenser enters the battlefield, proliferate.
Whenever you proliferate during your turn, draft a card from Contagion Dispenser's spellbook. This ability triggers only once each turn.

When Contagion Engine enters the battlefield, put a -1/-1 counter on each creature target player controls.
{4}, {T}: Proliferate twice.

When Contagious Vorrac enters the battlefield, look at the top four cards of your library. You may reveal a land card from among them and put it into your hand. Put the rest on the bottom of your library in a random order. If you didn't put a card into your hand this way, proliferate.

Enchant creature
When Convenient Target enters the battlefield, suspect enchanted creature.
Enchanted creature gets +1/+1.
{2}{R}: Return Convenient Target from your graveyard to your hand.

When Converter Beast enters the battlefield, incubate 5.

Coral Atoll enters the battlefield tapped.
When Coral Atoll enters the battlefield, sacrifice it unless you return an untapped Island you control to its owner's hand.
{T}: Add {C}{U}.

Defender
When Coral Barrier enters the battlefield, create a 1/1 blue Squid creature token with islandwalk.

Whenever you cast a kicked spell, draw a card, then discard a card.
When Coralhelm Chronicler enters the battlefield, look at the top five cards of your library. You may reveal a card with a kicker ability from among them and put it into your hand. Put the rest on the bottom of your library in a random order.

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

When Corpse Appraiser enters the battlefield, exile up to one target creature card from a graveyard. If a card is put into exile this way, look at the top three cards of your library, then put one of those cards into your hand and the rest into your graveyard.

When Corpse Connoisseur enters the battlefield, you may search your library for a creature card, put that card into your graveyard, then shuffle.
Unearth {3}{B}

Infect
When Corpse Cur enters the battlefield, you may return target creature card with infect from your graveyard to your hand.

Skeletons you control get +1/+0 and have haste.
When Corpses of the Lost enters the battlefield, create a 2/2 black Skeleton Pirate creature token.
At the beginning of your end step, if you descended this turn, you may pay 1 life. If you do, return Corpses of the Lost to its owner's hand.

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

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

When Corrupt Eunuchs enters the battlefield, it deals 2 damage to target creature.

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

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

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

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.

When Council of Advisors enters the battlefield, draw a card.