Dross Scorpion + Elemental Mastery + Woe Strider + Encroaching Mycosynth

Dross Scorpion

Elemental Mastery

Woe Strider

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 Woe Strider 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 Woe Strider ability.
5. Repeat.

This loop turns a high-powered creature into an endless engine of creation and sacrifice, all thanks to Encroaching Mycosynth turning every nonland permanent you control into an artifact. With that global transformation in play, sacrificing an Elemental token created by Elemental Mastery to Woe Strider triggers Dross Scorpion to untap your enchanted creature. That lets you tap it right back to generate a fresh batch of tokens, while Woe Strider provides the reliable sacrifice outlet you need to keep the cycle spinning infinitely.