Deathtouch
Whenever a creature you control with deathtouch deals damage to a planeswalker, destroy that planeswalker.
{2}{G}, Exile Contagion Brewer from your graveyard: Return target creature card with deathtouch from your graveyard to your hand.

Enchant creature
When Contain for Study enters, tap enchanted creature.
You control enchanted creature.
Enchanted creature doesn't untap during its controller's untap step.

Controlled Ecosystem enters tapped.
{T}: Add {G} or {U}.
{4}: Make a pledge. Activate only as a sorcery.

You may look at the top card of your library any time.
You may cast artifact and enchantment spells from the top of your library.
{T}, Sacrifice three artifacts and/or enchantments: Search your library for a card, then shuffle and put that card on top.

Corgan Bourgeois's power is equal to the number of artifacts you control.
Whenever Corgan Bourgeois or another artifact you control enters, you gain 1 life.

Whenever a creature dies, scry 1.

Corgan Sprawl enters tapped.
{T}: Add {B} or {R}.
{T}, Discard another card named Corgan Sprawl: Draw a card.

Whenever a creature you control deals combat damage to a player, you may sacrifice it. If you do, draw a card. Otherwise, surveil 1.

Menace
Whenever Corporate Mentor attacks, teach target attacking creature with lesser power menace.

Choose one —
• Return target creature card from a graveyard to its owner's hand.
• Exile target creature card in a graveyard, then draw a card.

Deathtouch
When Corpse Thieves enters, mill three cards.
Corpse Thieves's power is equal to the greatest mana value among cards in your graveyard.

{C/B}: Integrate target card in a graveyard.
As long as a creature card with flying is integrated onto Corpsepyre Fiend, it has flying. The same is true for first strike, double strike, deathtouch, haste, hexproof, indestructible, lifelink, reach, trample, and vigilance.

Flash
When Corrosive Spitter enters, destroy all creatures that were dealt damage this turn.

Whenever Corrupt Congressman enters or attacks, make a pledge.
Cliques you control have “Pledge — {4}: Each opponent loses 3 life unless they discard a card or sacrifice a creature. Activate only as a sorcery.”

When Cosmic Colossus enters, if you cast it from your hand, cast a copy of target card in exile without paying its mana cost unless an opponent exiles two nonland permanents they control.

Choose up to X target creatures. Switch their power and toughness until end of turn.
All creatures get -3/-3 until end of turn.

{T}: Add {C}.
{X}{1}: Court of Miracles dares X.

Menace
When Covert Infiltrator is put into your graveyard from your library, you may pay 2 life. If you do, return it to your hand.

Flying, ward {1}
Whenever you cast an instant or sorcery spell, mill a card. Return an instant or sorcery card milled this way to your hand. If you can't, put a +1/+1 counter on Covetous Frostwyrm.

{2}, Sacrifice another creature: Put a +1/+1 counter on Coward-Eater. Draw a card.

{T}: Add {C}.
{1}, {T}, Sacrifice Cradle of Rebirth: Copy target spell you control which had its flashback cost paid. You may choose new targets for the copy.

Gain control of target permanent. Untap it. It gains haste until end of turn.

Trample
Whenever one or more creatures you control with trample deal combat damage to a player or planeswalker, put a +1/+1 counter on target creature you control.

Exile target creature with flying.

Crowdqueller Golem enters tapped.