The Call of Cthulhu

Hexproof from spells and abilities
At the beginning of each player’s upkeep they create a 1/1 black cultist creature token with “ At the beginning of your end step, you lose 2 life” and “{3}: Sacrifice this creature: you create a 3/2 horror creature token that is all colors”
Whenever a cultist dies that creature’s controller may pay {2}, if they do so they create a clue token
If there are ever more horrors than clues transform Call of Cthulhu