Dross Scorpion + Elemental Mastery + Umbral Collar Zealot + Encroaching Mycosynth

Dross Scorpion

Elemental Mastery

Umbral Collar Zealot

Encroaching Mycosynth

How it works

1. Activate the creature with Elemental Mastery attached by tapping it, creating a number of 1/1 Elemental creature tokens with haste equal to its power.
2. Activate Umbral Collar Zealot by sacrificing an Elemental.
3. When the Elemental dies as an artifact due to Encroaching Mycosynth, Dross Scorpion triggers, untapping the creature with Elemental Mastery attached.
4. Resolve the Umbral Collar Zealot ability.
5. Repeat.

This brew transforms your entire board into a relentless token-producing engine by turning your nonland permanents into artifacts via Encroaching Mycosynth. With Elemental Mastery enchanting a creature, you can tap it to flood the battlefield with Elemental tokens, which immediately inherit that artifact type and become ready to feed into Umbral Collar Zealot. As each token is sacrificed to the Zealot, Dross Scorpion's triggered ability steps in to untap your enchanted creature, allowing you to repeat the loop indefinitely for infinite tokens, deaths, and surveils.