Animation Module + Decoction Module + Fabrication Module + Berta, Wise Extrapolator

Animation Module

Decoction Module

Fabrication Module

Berta, Wise Extrapolator

How it works

1. Cause a creature to enter the battlefield.
2. Decoction Module triggers, causing you to get E.
3. Fabrication Module triggers, putting a +1/+1 counter on Berta.
4. Berta and Animation Module trigger.
5. Resolve the Berta trigger, adding 1.
6. Resolve the Animation Module trigger, causing you to pay 1 to create a 1/1 Servo artifact creature token.
7. When the Servo enters, Decoction Module triggers, causing you to get E.
8. Repeat from step 3.