msem-instigator

Whenever Evaldi's Muse or another nontoken creature enters the battlefield under your control, you gain 2 life.
When Evaldi's Muse leaves the battlefield, create two 1/1 green and blue Elf creature tokens.

At the beginning of your upkeep, return a permanent you control to its owner's hand.
You may play an additional land on each of your turns.

Whenever Grin, Scourge of Goresand attacks, when you cast your next instant or sorcery spell this turn with mana value 3 or less, copy that spell. You may choose new targets for the copy.
Dash {2}{R} (You may cast this spell for its dash cost. If you do, it gains haste, and it's returned from the battlefield to its owner's hand at the beginning of the next end step.)

Prowess
Whenever Siv Katari, Rebel Technician attacks, create a tapped and attacking X/X colorless Construct artifact creature token with prowess, where X is Siv Katari's power. Exile that token at end of combat.

{T}: Add {C}.
{2}, Pay 2 life: Starved Oasis becomes a 4/2 Elemental creature until end of turn. It's still a land.

Tarmovore's power and toughness are each equal to twice the number of card types among cards in all graveyards.