Detrichor, the Hate-Sower

Hexproof
At the beginning of each player's end step, that player may create X 4/1 black Horror creature tokens with, "Creatures you control attack each turn if able," where X is the number of creatures that attacked this turn. If that player does each opponent does the same.
{g} Sacrifice three creatures, Detrichor gains Indestructible until end of turn.