Cleric Class + Crystalline Crawler + Soulmender + Pemmin's Aura

Cleric Class

Crystalline Crawler

Soulmender

Pemmin's Aura

How it works

1. Activate Soulmender by tapping it, causing you to gain 2 life.
2. Cleric Class triggers, putting a +1/+1 counter on Crystalline Crawler.
3. Activate Crystalline Crawler's first ability by removing a +1/+1 counter from it, adding .
4. Activate Pemmin's Aura's first ability by paying , untapping Soulmender.
5. Repeat.

By turning Soulmender into a self-contained mana and life battery, this loop effortlessly spins out of control. Pemmin's Aura provides the crucial untap engine fueled by the blue mana you generate, while Cleric Class acts as the bridge by translating your endless lifegain directly into a +1/+1 counter. That counter lands squarely on Crystalline Crawler, which immediately sacrifices it to feed the Aura's untap cost and keep the whole chain moving.