Cauldron of Souls + Dross Scorpion + Arsenal Thresher + Goblin Bombardment

Cauldron of Souls

Dross Scorpion

Arsenal Thresher

Goblin Bombardment

How it works

1. Activate Cauldron of Souls by tapping it, giving Arsenal Thresher persist until end of turn.
2. Activate Goblin Bombardment by sacrificing Arsenal Thresher.
3. When Arsenal Thresher dies, its persist ability and Dross Scorpion trigger.
4. Resolve the Dross Scorpion trigger, untapping Cauldron of Souls.
5. Resolve the Arsenal Thresher trigger, returning it from your graveyard to the battlefield with a -1/-1 counter on it, and then choosing to reveal at least one artifact card from your hand to remove the -1/-1 counter.
6. Resolve the Goblin Bombardment ability, dealing 1 damage to any target.
7. Repeat.

This ingenious engine turns a cycle of resurrection and mechanical tinkering into endless destruction, utilizing Cauldron of Souls to grant persist to Arsenal Thresher so it can repeatedly cheat death. As Arsenal Thresher hits the graveyard, Dross Scorpion's watchful eye notices an artifact creature dying and springs into action, untapping the Cauldron to prep it for the next iteration. Meanwhile, Goblin Bombardment serves as both the sacrificial altar and the win condition, converting each recursion into a point of direct damage to any target.