msem-instigator

Defender
Prismatic — Whenever you cast a multicolored spell, Squall Serpent gets +1/+1 until end of turn and can attack this turn as though it didn't have defender.

Counter target artifact or sorcery spell.

{1}, {T}: Untap target creature.

Enchant creature or enchantment
Enchanted permanent doesn't untap during its controller's untap step.
Enchanted permanent can't have counters put on it.

Destroy target attacking creature with mana value 3 or less.

Put a +1/+1 counter on target creature. (Then exile this card. You may cast the creature later from exile.)

Whenever a creature enters under your team's control, reveal the top card of your library. If it's a creature card, you gain 2 life.

Flash
When Stalker in the Mist enters, up to one target creature gets -1/-0 until end of turn.

Bloodprice {2}{U} (You may cast this card by sacrificing a creature and paying its bloodprice.)

Voracious 2 (As this enters, you may sacrifice up to two artifacts and/or creatures. This creature enters with that many +1/+1 counters on it.)
Each creature you control with a +1/+1 counter on it has trample.

Vigilance, trample
At the beginning of combat on your turn, put a +1/+1 counter on target legendary creature you control.

When Stalwart Physicker enters, you may remove a -1/-1 counter from target creature.

Flash (You may cast this spell any time you could cast an instant.)
When Stampede Instigator enters, target creature gets +2/+3 until end of turn.

Whenever Starfall Instructor attacks, harmonize. (Trigger up to one harmony of a permanent you control.)
Harmony — Each opponent loses 2 life.

Whenever Stargaze Spirit or another creature dies, you may gain 1 life.
Revive {3}{W} ({3}{W}, 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.)

You may discard a card. If you do, draw two cards.
Type leitmotif (If you cast this spell from your hand, exile it as it resolves. When you cast your next spell that shares a type with this card, you may cast this from exile without paying its mana cost.)

Flying
Sacrifice a Fungus, Saproling, Plant, or Insect: You gain 2 life.

Choose one —
• Destroy target artifact or land.
• State Collapse deals damage equal to the number of artifacts you control to any target.

This spell costs {2} less to cast if you cast it during your main phase.
Tap up to two target creatures. Put a stun counter on each of those creatures.

Flying
Augmented — Whenever Station Repair Technician enters or attacks, if you've spent {W}{U}{B}{R}{G} to cast spells this turn, creatures you control gain flying until end of turn.

{T}: Add {C}.
{3}, {T}: Create an Idol token. (It's an artifact with “{1}, Sacrifice this artifact: Put a +1/+1 counter on target creature. Activate only as a sorcery.”)

{G}, Discard a card: Staunch Constrictor gets +1/+1 until end of turn.

Enchant creature
Enchanted creature gets +2/+3.
As long as enchanted creature has a +1/+1 counter on it, it has vigilance.

Target creature gets +1/+0 and gains double strike until end of turn.

Persist (When this creature dies, if it had no -1/-1 counters on it, return it to the battlefield under its owner's control with a -1/-1 counter on it.)