Once during each of your turns, you may cast a creature spell from your graveyard by exiling three other cards from your graveyard in addition to paying its other costs.
Whenever one or more creatures you control enter, if one or more of them entered from a graveyard or was cast from a graveyard, put two +1/+1 counters on Kotis.
Kotis turns your graveyard into a recurring toolbox, casting creatures from it each turn (exiling three cards) to both rebuild your board and grow Kotis with +1/+1 counters. You self-mill and reanimate to deploy threats faster than the table, then close with a swollen Kotis or a creature value-engine. The deck wants to fill its yard early, then convert that fuel into bodies and counters every single turn.
Built-in recursion gives relentless card advantage and grindy resilience against removal
Kotis grows quickly, becoming a fast clock or commander-damage threat with evasion
Self-mill turns graveyard hate's target into your engine while filling fuel
Sultai colors offer the best ramp, tutors, and reanimation in the format