Angel of Indemnity + Deathrender + Cloudstone Curio + Ashnod's Altar

Angel of Indemnity

Deathrender

Cloudstone Curio

Ashnod's Altar

How it works

1. Activate Ashnod's Altar by sacrificing the creature with Deathrender attached, adding CC.
2. When the creature dies, Deathrender triggers, putting Angel of Indemnity from your hand onto the battlefield.
3. When Angel of Indemnity enters the battlefield, it and Cloudstone Curio trigger.
4. Resolve the Cloudstone Curio trigger, choosing to return nothing to your hand from the battlefield.
5. Resolve the Angel of Indemnity trigger, returning any nonartifact creature card from your graveyard to the battlefield.
6. When the creature enters the battlefield, Cloudstone Curio triggers, returning Angel of Indemnity from the battlefield to your hand.
7. Activate Deathrender's equip ability by paying 2, attaching it to the creature.
8. Repeat.