Nim Deathmantle + Krark-Clan Ironworks + Accomplished Automaton

Nim Deathmantle

Krark-Clan Ironworks

Accomplished Automaton

How it works

1. Activate Krark-Clan Ironworks by sacrificing Accomplished Automaton, adding CC.
2. When Accomplished Automaton dies, Nim Deathmantle triggers, causing you to pay 4 to return Accomplished Automaton from your graveyard to the battlefield, and attach Nim Deathmantle to it.
3. When Accomplished Automaton enters the battlefield, its fabricate ability triggers, creating a 1/1 Servo artifact creature token.
4. Activate Krark-Clan Ironworks by sacrificing the Servo, adding CC.
5. Repeat.

This loop hinges on a clever economy of artifacts and mana, turning the death of a single machine into an endless manufacturing cycle. By feeding Accomplished Automaton to Krark-Clan Ironworks, you generate the four mana needed to pay for the triggered ability of Nim Deathmantle, which immediately brings the Automaton right back to the battlefield. Every time the Automaton returns, its fabricate ability creates a Servo artifact creature token that you can then sacrifice to the Ironworks for the remaining mana to keep the loop going indefinitely.