Animation Module + Scion of the Swarm + Krark-Clan Ironworks + Dross Harvester

Animation Module

Scion of the Swarm

Krark-Clan Ironworks

Dross Harvester

How it works

1. Activate Krark-Clan Ironworks by sacrificing an artifact creature, adding CC.
2. When the creature dies, Dross Harverster's second ability triggers, causing you to gain 2 life.
3. Scion of the Swarm triggers, putting a +1/+1 counter on itself.
4. Animation Module triggers, causing you to pay 1 to create a 1/1 Servo artifact creature token.
5. Repeat.

This loop relies on an engine of constant sacrifice and rebirth, anchored by Krark-Clan Ironworks to convert your artifacts into raw colorless mana. Dross Harvester feeds this cycle by turning each death into a burst of life, which in turn causes Scion of the Swarm to grow larger with a fresh +1/+1 counter. Every time that counter lands, Animation Module triggers to let you pay a single mana and forge a brand new Servo artifact creature token to replace the one you lost. Because Krark-Clan Ironworks provides more than enough mana to pay the Animation Module's fee, the process becomes self-sustaining and endlessly repeatable.