Fabrication Module + Basking Broodscale + Aetherstorm Roc

Fabrication Module

Basking Broodscale

Aetherstorm Roc

How it works

1. Cast Basking Broodscale by paying its mana cost.
2. When Basking Broodscale enters, Aetherstorm Roc triggers, causing you to get E.
3. Fabrication Module triggers, putting a +1/+1 counter on Basking Broodscale
4. Basking Broodscale triggers, creating a creature token.
5. When the creature token enters, Aetherstorm Roc triggers, causing you to get E.
6. Repeat from step 3.

This elegant loop transforms a single creature entering the battlefield into an unstoppable cascade of growth and resources. As Aetherstorm Roc watches your creatures arrive to constantly supply fresh energy counters, Fabrication Module converts that energy directly into +1/+1 counters on Basking Broodscale. The Broodscale happily embraces those counters with its own trigger, spawning an Eldrazi Spawn token whose arrival restarts the entire cycle through Aetherstorm Roc's watchful eye.