This clever engine transforms Yurlok of Scorch Thrash into a lethal weapon by feeding its activated mana ability into Hateflayer's untap-based pinging power, exiled via Agatha's Soul Cauldron to grant Hateflayer's activated ability to your creatures. Agatha of the Vile Cauldron is the crucial cost-reducer that makes this loop possible, lowering the mana requirement so that Yurlok can profitably fuel the ability and repeatedly untap itself. Because Yurlok's mana-adding ability produces more mana than the activation costs demand, you can endlessly burn down your opponents while leveraging Yurlok's passive penalty, which forces players to lose life for any unspent mana left in their pools.