msem-instigator

Haste

Flash
When Fireshaper Adept enters, copy up to one target activated or triggered ability. You may choose new targets for the copy.

First strike, haste
Whenever you cast an instant or sorcery spell, Flamedaunt Courier gets +2/+0 until end of turn.

When Fodder Goblins enters, create a 1/1 red Goblin creature token.

{T}, Sacrifice Forgewatcher: Add two mana of any one color. If that mana is spent on a creature spell, it gains haste until end of turn.

Prowess (Whenever you cast a noncreature spell, this creature gets +1/+1 until end of turn.)
Whenever you cast a noncreature spell, Frilled Drakeling gains menace until end of turn.

Trample
Experience (Whenever this creature attacks, if it has fewer than three +1/+1 counters on it, put a +1/+1 counter on it.)

Prowess
Wither (This deals damage to creatures in the form of -1/-1 counters.)

When Goblin Arsonist dies, you may have it deal 1 damage to any target.

Haste
Encourage ({T}: Another target creature you control gets +1/+1 until end of turn. Encourage only as a sorcery.)

When Goblin Rocktosser enters, you may sacrifice a land. If you do, put a +1/+1 counter on Goblin Rocktosser.

First strike (This creature deals combat damage before creatures without first strike.)

{T}: Target creature with power 2 or less can't be blocked this turn.

When Goblin Twinblades enters, create a 1/1 red Goblin creature token.

Haste
{2}{W}, {T}: Hair-Trigger Marshall deals 2 damage to target blocking creature.

Whenever you cast a spell during an opponent's turn, Haughty Priest deals 1 damage to that player.

Trample
Whenever you cast a noncreature spell, crystallize. If you create a Treasure this way, Heartforge Savant deals 1 damage to you for each Treasure you've created this turn. (Put a +1/+1 counter on a creature you control or create a Treasure.)

Gestalt (When this or another creature enters under your control, you may merge it with the one in play, keeping counters and attachments. They become the permanent on top plus all abilities from under it.)
Whenever this creature attacks, if it's merged with another card or token, it deals 2 damage to target player or planeswalker.

Haste
{1}{R}, {T}: Attacking creatures you control get +1/+0 until end of turn.

Double strike
When a creature scavenges Hook-Style Trainee, put a double strike counter on that creature.
Scavenge {4}{R} ({4}{R}, Exile this card from your graveyard: Put a number of +1/+1 counters equal to this card's power on target creature. Scavenge only as a sorcery.)

Ifram's Cavalier enters with two additional +1/+1 counters on it if you didn't cast it from your hand.

Haste
Ifram's Emissary gets +1/+1 as long as you control a green or blue permanent.

{R}: Igniting Lavaling gets +1/+0 until end of turn.
{4}{R}, Sacrifice Igniting Lavaling: It deals 3 damage to any target.

When Improvisionist enters, if it was the second spell you cast this turn, exile the top card of your library. You may play that card until the end of your next turn.

Whenever Infiltrator of the Anomalous deals combat damage to a player, add {R}. Until end of turn, you don't lose this mana as steps and phases end.