Nim Deathmantle + Ashnod's Altar + Bridge from Below

Nim Deathmantle

Ashnod's Altar

Bridge from Below

How it works

1. Activate Ashnod's Altar by sacrificing a nontoken creature, adding CC.
2. When the creature dies, Bridge from Below and Nim Deathmantle triggers.
3. Resolve the Bridge from Below trigger, creating a 2/2 Zombie creature token.
4. Activate Ashnod's Altar by sacrificing the Zombie, adding CC.
5. Resolve the Nim Deathmantle trigger from step 2, causing you to pay 4 to return the nontoken creature from your graveyard to the battlefield, and attach Nim Deathmantle to it.
6. Repeat.