Cauldron of Souls + Dross Scorpion + Arsenal Thresher + Viscera Seer

Cauldron of Souls

Dross Scorpion

Arsenal Thresher

Viscera Seer

How it works

1. Activate Cauldron of Souls by tapping it, giving Arsenal Thresher persist until end of turn.
2. Activate Viscera Seer 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 Viscera Seer ability, causing you to scry 1.
7. Repeat.

This clever loop turns the graveyard into a revolving door by leveraging **Cauldron of Souls** to repeatedly grant persist to **Arsenal Thresher**. When you feed the Thresher to **Viscera Seer**, its death triggers both its own persist and **Dross Scorpion**'s passive metalcraft, allowing the Scorpion's trigger to untap the Cauldron. The secret to keeping the loop going indefinitely lies in Arsenal Thresher's replacement effect, which lets you reveal artifacts from your hand as it enters to place a +1/+1 counter that immediately neutralizes the -1/-1 counter from persist.