msem-instigator

(Activate each submodule once as a sorcery. When this enters, activate one submodule for free.)
{3}{R}: Rage
The first instant or sorcery spell you cast during your next turn costs {3} less to cast.
{3}{G}: Rampage
The first permanent spell you cast during your next turn costs {3} less to cast.
{2}{R}{G}: Ruin
Fury Module gains “Whenever you cast a spell with mana value 5 or greater, you may draw a card.”

Fury Swipes deals 2 damage divided as you choose among one or two targets. Scry 2.

Target creature gains flying and double strike until end of turn.
Flashback {2}{U}{R} (You may cast this card from your graveyard for its flashback cost. Then exile it.)

Target creature gets +1/+0 and gains first strike until end of turn.
Monument {4}{R} (You may cast this transformed from your graveyard for its monument cost. Exile it if it would leave the battlefield or not resolve.)

If you control an Angel, Demon, Faerie, or Spirit, draw a card.
Exile target nonland permanent. Return that card to the battlefield under its owner's control at the beginning of the next end step.

Galactic Detonation deals 2 damage to any target.
Augmented — If you've spent {W}{U}{B}{R}{G} to cast spells this turn, Galactic Detonation deals 5 damage instead.

{7}{R}: Up to three target creatures you control get +3/+0 and gain menace until end of turn. This ability costs {2} less to activate if you control a legendary creature.

Improve {R} ({R}: Put a +1/+1 counter on this creature. This costs {1} more to activate for each +1/+1 counter on it. Improve only as a sorcery.)
Whenever Galdurheim Reaver attacks, it deals damage to the player or planeswalker it's attacking equal to the number of embattled creatures you control. (A creature is embattled if it has a counter on it or has a permanent you control attached to it.)

Vigilance
Improve {1}{W} ({1}{W}: Put a +1/+1 counter on this creature. This costs {1} more to activate for each +1/+1 counter on it. Improve only as a sorcery.)

Flash
Flying
When Gale Conjurant enters, return target spell to its owner's hand if its mana value is less than or equal to the number of creatures in Gale Conjurant's pack. (Two or more creatures you control with equal power are in a pack.)

Return target creature to its owner's hand. You may have another target creature gain flying until end of turn.

Flying
Instant, sorcery, and Wizard spells you cast cost {1} less to cast.

Whenever Gallant Chevalier attacks or blocks, put a +1/+1 counter on it and each other creature you control with a +1/+1 counter on it.

When Gallipot Apothecary enters, create a Vial token. (It's an artifact with “{1}, Sacrifice this and another permanent: Draw a card. Activate only during your 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.)

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

Create a 1/1 white Soldier creature token. It gets +1/+1 and gains first strike until end of turn.

Flying
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.)

You may return a land you control to its owner's hand rather than pay this spell's mana cost.
Galvan Coal Line enters tapped.
{T}: Add {R}.

Prowess
Whenever an artifact you control enters, you may discard a card. If you do, draw a card.

As an additional cost to cast this spell, discard a card.
Draw three cards.

Equipped creature has haste.
Whenever equipped creature deals combat damage to a player, discard a card. If you do, draw a card.
Equip {1}

When Gamhaugen Stablehand enters, put a +1/+1 counter on target creature you control. You gain 1 life.

(Transform this if it's not attached to a creature. Pay {R} as a sorcery to unattach it.)
Enchant creature you control
Gamhaugen War Swine's rider gets +1/+1 and has haste.

(Transform this if it's not attached to a creature. Pay {3}{U} as a sorcery to unattach it.)
Enchant creature you control
Gamhaugen Warbeast's rider gets +2/+2 and has flying.