Atla Palani, Nest Tender + Mortuary + Ashnod's Altar

Atla Palani, Nest Tender

Mortuary

Ashnod's Altar

How it works

1. Activate Ashnod's Altar by sacrificing a nontoken Egg or a nontoken creature with changeling, adding CC.
2. When the creature dies, Atla Palani and Mortuary trigger.
3. Resolve the Mortuary trigger, putting the creature on top of your library from your graveyard.
4. Resolve the Atla Palani trigger, revealing the creature from the top of your library and then putting it onto the battlefield.
5. Repeat.

This engine uses Atla Palani, Nest Tender to cheat creature cards into play while Ashnod's Altar funds the activation and provides a sacrifice outlet for a nontoken creature with changeling. Whenever that changeling dies, Mortuary steps in to ensure it never actually stays in the graveyard, instantly stacking it right back onto the top of your library. That way, when Atla Palani's triggered ability resolves, it guarantees you hit that exact same creature card and slide it right back onto the battlefield, ready to be sacrificed to Ashnod's Altar all over again for an endless loop of colorless mana and triggers.