Enduring Renewal + Broodguard Elite + Crystalline Crawler + Thermopod

Enduring Renewal

Broodguard Elite

Crystalline Crawler

Thermopod

How it works

1. Cast Broodguard Elite for its warp cost by paying 1.
2. Activate Thermopod by sacrificing Broodguard Elite, adding .
3. When Broodguard Elite dies, it and Enduring Renewal trigger.
4. Resolve the Broodguard Elite trigger, putting a +1/+1 counter on Crystalline Crawler.
5. Resolve the Enduring Renewal trigger, returning Broodguard Elite from your graveyard to your hand.
6. Activate Crystalline Crawler by removing a +1/+1 counter from it, adding .
7. Repeat.