Nim Deathmantle + Ashnod's Altar + Peema Outrider

Nim Deathmantle

Ashnod's Altar

Peema Outrider

How it works

1. Activate Ashnod's Altar by sacrificing Peema Outrider, adding CC.
2. When Peema Outrider dies, Nim Deathmantle triggers, causing you to pay 4 to return Peema Outrider from your graveyard to the battlefield, and attach Nim Deathmantle to it.
3. When Peema Outrider enters the battlefield, its fabricate ability triggers, creating a 1/1 Servo artifact creature token.
4. Activate Ashnod's Altar by sacrificing the Servo, adding CC.
5. Repeat.

This clever loop turns Peema Outrider and Ashnod's Altar into a self-sustaining engine by letting the creature fund its own resurrection. Whenever you sacrifice Peema Outrider to Ashnod's Altar for two mana, Nim Deathmantle steps in to return it to the battlefield for four mana, a cost easily covered by sacrificing both the Outrider and the 1/1 Servo artifact creature token created by the Outrider's fabricate trigger. By looping this sequence, you generate infinite death, enter-the-battlefield, and sacrifice triggers while keeping your mana neutral.