Fabrication Module + Decoction Module + Scurry Oak

Fabrication Module

Decoction Module

Scurry Oak

How it works

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