msem-instigator

Sacrifice a creature: Surveil 1. (Look at the top card of your library. You may put that card into your graveyard.)

Whenever you cast an instant or sorcery spell, create a 1/1 red Alien creature token.
{2}{R}, Sacrifice two Aliens: Copy target instant or sorcery spell you control. You may choose new targets for the copy.

(As you complete a condition, decode it. After all are decoded, you solve the mystery and transform this.)
When Mystery of the Crashed Craft enters the battlefield, create a 1/1 red Alien creature token.
{MAG}—You cast an instant spell.
{MAG}—You cast a sorcery spell.

Whenever a land enters the battlefield under your control or a land card is put into your graveyard from anywhere, create a 0/1 green Plant creature token.
{3}{G}{G}: Put a +1/+1 counter on each other creature you control.