Siegehorn Ceratops + Animation Module + Mana Echoes + Terror of the Peaks

Siegehorn Ceratops

Animation Module

Mana Echoes

Terror of the Peaks

How it works

1. Deal damage to Siegehorn Ceratops.
2. Siegehorn Ceratops triggers, putting two +1/+1 counters on itself.
3. Animation Module triggers, causing you to pay 1 to create a 1/1 Servo artifact creature token.
4. The Servo enters the battlefield, triggering Terror of the Peaks and Mana Echoes.
5. Resolve the Mana Echoes trigger, adding C for each Servo you control.
6. Resolve the Terror of the Peaks trigger, dealing 1 damage to Siegehorn Ceratops.
7. Repeat from step 2.