Krasis Incubation + Crystalline Crawler + Zirda, the Dawnwaker + Semblance Anvil + Vorinclex, Monstrous Raider

Krasis Incubation

Crystalline Crawler

Zirda, the Dawnwaker

Semblance Anvil

Vorinclex, Monstrous Raider

How it works

1. Activate Krasis Incubation by paying and returning it to your hand, putting four +1/+1 counters on Crystalline Crawler.
2. Activate Crystalline Crawler's first ability four times by removing four +1/+1 counters from it, adding .
3. Cast Krasis Incubation by paying due to Semblance Anvil, attaching it to Crystalline Crawler.
4. Repeat.

This clever loop relies on Zirda, the Dawnwaker to slash the activation cost of Krasis Incubation down to a mere {G}{U}, letting you bounce the Aura back to your hand for the exact mana value it produces. Semblance Anvil pulls double duty by discounting the re-casting cost of Krasis Incubation to match, closing the loop so you can replay it continuously. Meanwhile, Vorinclex, Monstrous Raider doubles the counters placed on Crystalline Crawler, turning every resolution into a net surplus of power that feeds the crawler's mana-producing ability.