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.

Flying
When this creature enters, exile up to one target nontoken creature you don't control.
When this creature leaves the battlefield, the exiled card's owner draws X cards and gains X life, where X is half that card's mana value, rounded up.

When Contest Coordinator enters, look at the top five cards of your library. You may reveal a Plains card or a nonland card with an activated ability from among them and put it into your hand. Put the rest on the bottom of your library in a random order.

Once each turn, when you activate an ability of a creature you control, untap that creature and put a +1/+1 counter on it.

Once each turn, when you activate a nonmana ability, you gain 2 life.

{T}, Tap another untapped creature you control: You may tap or untap another target creature.
Whenever Contest Star becomes untapped, draw a card.

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

Flash
Whenever Convol enters or attacks, untap target creature you control. Until end of turn, it has base power and toughness 5/5 and gains hexproof and “Whenever this creature deals combat damage to a player, draw two cards.”

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.

{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.

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.

Menace
When Covert Infiltrator is put into your graveyard from your library, you may pay 2 life. If you do or if you control a blue permanent, return this card 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.

Flying
Flow — {2}{W/U}: Another target creature you control gains flying until end of turn. Activate only as a sorcery.

As an additional cost to cast this spell, sacrifice an artifact or creature, or pay 3 life.
Destroy target creature or planeswalker.

Whenever a Subroutine you control runs, exile the top card of your library face-down.
{R}, Discard your hand, Sacrifice this enchantment: Put all cards exiled with this enchantment into your hand.

{T}: Add one mana of any color.
{T}: Draw a card, then discard a card. Activate only if you've cast a non-Human creature spell this turn.

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

Crucible Takedown deals damage to target creature equal to the greatest mana value among permanents you control. Surveil 2.