Cauldron of Souls + Dross Scorpion + Arsenal Thresher + Megatog

Cauldron of Souls

Dross Scorpion

Arsenal Thresher

Megatog

How it works

1. Activate Cauldron of Souls by tapping it, giving Arsenal Thresher persist until end of turn.
2. Activate Megatog 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 Megatog ability, giving it +3/+3 until end of turn.
7. Repeat.

This delightful loop turns a mechanical recycling plant into a massive threat by pairing Cauldron of Souls with Dross Scorpion to perpetually trade a creature's life for untaps. When Megatog serves as the sacrifice outlet, it happily devours Arsenal Thresher to fuel its own monstrous power boosts while triggering the Scorpion to refresh your artifact enabler. The true brilliance of the loop lies in Arsenal Thresher's unique entry ability, which lets you repeatedly reveal artifacts from your hand to cancel out the pesky -1/-1 counter from persist, ensuring the creature never runs out of steam.