Feed the Swarm

Coven — At the beginning of combat on your turn, put a +1/+1 counter on up to one target creature you control. Then if you control three or more creatures with different powers, draw a card.

Whenever another Zombie you control dies, if it didn't have decayed, create a 2/2 black Zombie creature token with decayed. (It can't block. When it attacks, sacrifice it at end of combat.) At the beginning of your end step, you may sacrifice a Zombie. If you do, draw a card.

Whenever another creature you control dies, investigate. (Create a Clue token. It's an artifact with "2, Sacrifice this token: Draw a card.") Whenever you sacrifice a token, surveil 1. (Look at the top card of your library. You may put that card into your graveyard.)

Whenever another Human you control enters, put a +1/+1 counter on Kyler. Other Humans you control get +1/+1 for each counter on Kyler.

For each different power among creatures on the battlefield, choose a creature with that power. Destroy each creature not chosen this way.

Enchant player Nonlegendary creatures enchanted player controls have base power and toughness 3/3 and lose all creature types.

When this creature dies, return any number of other creature cards with total power X or less from your graveyard to the battlefield, where X is this creature's power. Exile this card.

Flash Flying Whenever this creature enters or attacks, choose any number of creatures with different powers. Those creatures gain double strike until end of turn.