msem-instigator

This spell costs {1} less to cast for each Desert you control.
When Crested Crustacean enters, return target permanent to its owner's hand.

Cresting Bay enters tapped unless you control a basic Island.
{T}: Add {U}.
{2}{U}{U}: Until end of turn, Cresting Bay becomes a 3/3 blue Elemental creature with “Whenever this creature attacks, you may draw a card then discard a card.” It's still a land.

When Gillo enters, reveal the top card of your library. If it's a land card, put it onto the battlefield tapped. If it's a creature card, put it into your hand.
As long as you control five or more creatures with different names, creatures you control get +1/+1 and have trample.

When Crimson Curtain Favored enters, starting with you, each player may discard any number of cards. When each player is finished discarding, choose one —
• Crimson Curtain Favored deals damage to each player equal to the number of cards in their hand.
• Each player draws a card for each card they discarded this way.

Flying, haste
When Crimson Hellmaw enters, it deals 3 damage to any target.
Revive {5}{R}{R} ({5}{R}{R}, Exile this card from your graveyard: Create a token that's a copy of it except it has no mana cost. Revive only as a sorcery.)

Haste
{R}{R}{R}, Discard your hand, Sacrifice Crimson Knight: Draw three cards.

Create three 2/2 red Noble creature tokens with disgraced 1. (Each enters with a -1/-1 counter. Whenever one deals combat damage to a player, remove all -1/-1 counters from it.)

Distribute four -1/-1 counters among any number of target creatures.

Flying
At the beginning of combat on your turn, create a 5/5 red Dragon creature token with flying and haste. That token attacks this combat if able.

Crimson Sunrise deals 4 damage to each creature. Each player sacrifices four nonbasic lands.

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.

When Crinster Tattooist enters, put a +1/+1 counter on each tapped creature you control.

Flying
Whenever an embattled creature you control attacks, tap target creature defending player controls. (A creature is embattled if it has a counter on it or has a permanent you control attached to it.)

Choose one or both—
• Target creature has base toughness 1 until end of turn.
• Remove all but one loyalty counter from target planeswalker.

Enchant creature
Whenever enchanted creature attacks, put a -1/-1 counter on it.

Enchant creature
Enchanted creature gets -6/-0.
Mirage {1}{U} (You may cast this spell as though it had flash for its mirage cost. If you do, sacrifice it at the beginning of the next cleanup step.)

(As an Encounter enters, choose an opponent to protect it while you and other players attack it. When defense counters are removed, create a 0/0 Army token if you don't control one, then put that many +1/+1 counters on a Army you control.)
When Crisis in Avaz enters, search your library for a basic land or Satrapy card, put it onto the battlefield tapped, then shuffle.

(As an Encounter enters, choose an opponent to protect it. You and others can attack it. When defense counters are removed, create a 0/0 Army token if you don't control one, then put that many +1/+1 counters on a Army you control.)
When Crisis in Danaj enters, return target creature an opponent controls to its owner's hand.

(As an Encounter enters, choose an opponent to protect it. You and others can attack it. When defense counters are removed, create a 0/0 Army token if you don't control one, then put that many +1/+1 counters on a Army you control.)
When Crisis in Kaneh enters, destroy up to one target creature or planeswalker.

(As an Encounter enters, choose an opponent to protect it. You and others can attack it. When defense counters are removed, create a 0/0 Army token if you don't control one, then put that many +1/+1 counters on a Army you control.)
When Crisis in Nizev enters, exile the top three cards of your library. Until the end of your next turn, you may play those cards.