Khala, the Stormbringer

At the beginning of your upkeep, create two 1/1
green and black Chaos Sprout token with menace.
{t}: Sacrifice any number of Chaos Sprout tokens. Search your library for a creature spell with converted mana cost equal to 1 plus the number of Chaos Sprouts you sacrificed, put that creature
onto the battlefield, then shuffle your library. Activate this ability only any time you can cast a sorcery.