msem-instigator

Improve {1} ({1}: Put a +1/+1 counter on this artifact. This costs {1} more to activate for each +1/+1 counter on it. Improve only as a sorcery.)
Whenever one or more creatures crew Cavalier Deluxe Roadster, you may phase out up to one of those creatures.
Crew 1. Activate only once during each of your turns.

Look at the top three cards of your library. Put one into your hand and the rest into your graveyard. You lose 1 life.

When Cave Eel enters, look at the top three cards of your library. Put one on top and the rest on the bottom in any order.

Vigilance, reach
Whenever Cave Spider blocks a creature with flying, Cave Spider gets +2/+0 until end of turn.

{T}: Add {C}.
{T}, Sacrifice Cave of Pleonexia: Destroy target nonbasic land an opponent controls. You and that player each create a Treasure token. Activate only as a sorcery and only if that land's controller controls four or more lands. (A Treasure token is an artifact with “{T}, Sacrifice this artifact: Add one mana of any color.”)

Trample
Cavern Carver has haste as long as you control another creature with flash or haste.

Whenever Cavern Monstrosity attacks, exile the bottom card of your library. You gain life equal to its mana value.

Flying
Whenever Cavern Scourge attacks, you may exile a card from your graveyard. If you do, you gain 3 life.

Cadence (Whenever you cast a spell, if its mana value is greater than this creature's power, put a +1/+1 counter on this creature.)
Whenever you cast a spell, if its mana value is less than Cavorting Beauty's power, remove a +1/+1 counter from Cavorting Beauty.

Flash
Return another artifact, creature, or enchantment you control to its owner's hand: Caylin Whirlwind gets +3/+3 until end of turn. Activate only once each turn.

Archive 4 (As this enters, shuffle the top four cards of your main library into a new face up library. Sacrifice this after the archived library is empty.)
{1}, Sacrifice a permanent: Put a permanent card with a mana value less than the sacrificed permanent's from the archived library onto the battlefield. Activate only as a sorcery.

[+1]: Untap up to one target creature. It gains deathtouch until your next turn.
[–2]: Target player sacrifices a creature. Return a permanent card from your graveyard to your hand.
[–5]: Put any number of permanent cards from your graveyard onto the battlefield, then sacrifice that many permanents.

Whenever a Soldier or Knight you control enters, you may sacrifice Ceanne's Dawnbringer. If you do, put your choice of two different counters on that creature from among +1/+1, first strike, lifelink, and vigilance.

Ceanne, Shield of Caerdyne enters with your choice of a +1/+1, first strike, lifelink, or vigilance counter.
Counters remain on Ceanne as it moves to any zone other than a player's hand or library.
{3}{G/W}: For each kind of counter on Ceanne, put a counter of that kind on another target creature you control. Activate only once each turn and only as a sorcery.

Enchant creature
Enchanted creature can't attack or block.
{3}{W}: Attach Cease Conflict to target creature.

Once each turn, when you sacrifice a permanent, you may put two progress counters on Ceaseless Research and surveil 2.
{2}{G}, Remove X progress counters from Ceaseless Research: Create an X/X green Mutant creature token. X can't be less than 3. Activate only as a sorcery.

Whenever a creature enters, if it entered from a graveyard or a player cast it from a graveyard, return Ceaseless Stalker from your graveyard to the battlefield at the beginning of the next end step.

Flash
When Ceaseless Valiant enters, another target permanent gains indestructible until end of turn.
Recite {1}{W} (You may cast this creature from your graveyard for its recite cost. If you do, exile it when it enters or if it would leave the battlefield.)

[+1]: Each opponent loses 1 life and you gain 1 life. Mill a card. If you do, you may shuffle a card from your graveyard into your library.
[0]: Any number of target players each discard a card. If you have an insight counter, return up to one creature card from your graveyard to your hand.
[0]: You get an insight counter.
[–2]: Target creature gets -3/-3 until end of turn.

Flying
When Celebrant of Jubilation enters, untap all creatures you control.
Cycling {2} ({2}, Discard this card: Draw a card.)

(Choose only one work as a sorcery to add its ability.)
When Celebrations of Ferocity enters, add {R}{G}. Spend this mana only to cast creature spells.
{4}{R}{R}: Hao'Tai's Wake
At the beginning of combat on your turn, target creature you control becomes a 4/4 red Dragon with flying until end of turn.
{1}{G}: Portrait of Qiyan
Creatures you control enter with an additional +1/+1 counter on them.

Create three 1/1 white Soldier creature tokens, two 2/2 white Knight creature tokens with vigilance, and a 4/4 white Angel creature token with flying.

Counter target activated or triggered ability of a nonland source. If an ability of a creature, enchantment, or planeswalker is countered this way, exile it.

Choose one —
• Destroy all creatures.
• Create a 4/4 white Angel creature token with flying and vigilance.

First strike
Whenever a creature blocks Celestial Conscript, put a -1/-1 counter on that creature.