msem-instigator

{1}{R}, Sacrifice Crackling Seaform: Counter target spell unless its controller has Crackling Seaform deal 3 damage to them.

Enchant land
When Cradle of Civilization enters, search your library for a basic land card, reveal it, put it into your hand, then shuffle.
Enchanted land has “{T}: Add one mana of any color.”

Crafter's Mistake deals 1 damage to target player or planeswalker. That player or that planeswalker's controller sacrifices an artifact.

Exile up to two target permanents you control, then return those cards to the battlefield under their owner's control.
Audition for blue. (Create a 1/1 Construct Actor creature token, a Wizard Role giving 2/2 and prowess, or a Warlock Role giving 2/1 and flying. Roles replace older ones.)

Menace
Whenever you sacrifice an artifact or creature, Crain's Crew gets +1/+1 until end of turn.

Enchant creature
Enchanted creature gets +1/+3 and has flying.

When Crane-Style Ascetic enters, choose one —
• Create a 1/1 white Bird creature token with flying.
• Put a +1/+1 counter on target creature you control.

Creatures you control gain trample until end of turn.
Draw a card.

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 any order.
Dominance — You may reveal a creature card from among them instead if you control the creature with the greatest power or tied for the greatest power.

{1}{R}: Crashcaller Nereid gets +1/+0 and gains trample until end of turn.

Menace (This creature can't be blocked except by two or more creatures.)
Whenever Crazed Bruiser attacks, it gets +2/+0 until end of turn.

Trample (This creature can deal excess combat damage to the player or planeswalker it's attacking.)
{2}{G}: Crazed Sprareos gets +2/+2 until end of turn. Activate only once each turn.

Harmony — Target player mills four cards.
When Creeping Pianist enters, harmonize. (Trigger up to one harmony of one permanent you control.)

Target player discards two cards.
Kindle 2—{1}{B}{B} ({1}{B}{B}, Exile this card from your graveyard: Create two 1/1 colorless Elemental creature tokens. Kindle only as a sorcery.)

Whenever Crescent Crasher attacks, put a +1/+1 counter on target attacking creature with lesser power.

{T}: Add {C}.
{3}, {T}: Scry 1. (Look at the top card of your library. You may put that card on the bottom of your library.)

Flying
Wanderlust — When Crest Skimmer enters, if you control four or more differently named lands, draw a card.

Flying
Death knell — Put a flying counter on target creature you control. (As a creature you control dies, trigger one death knell of that creature or another permanent you control.)

When Crinster Blacksmith enters, nourish 2. (To nourish 2, either put two +1/+1 counters on this creature or create two 1/1 white Citizen creature tokens.)

When Crinster Falconer enters, create a 1/1 blue Bird creature token with flying.

Defender
{T}: Another target creature gains haste until end of turn.

Vigilance
Crinster Ranger enters with X +1/+1 counters on it, where X is the number of +1/+1 counters among other creatures you control.

Whenever another creature named Crinster Sheepdog enters, nourish 1. (To nourish 1, either put a +1/+1 counter on this creature or create a 1/1 white Citizen creature token.)

Rapport — Whenever Crinster Stitcher and at least one other creature you control become tapped, tap target creature.