Nim Deathmantle + Ashnod's Altar + Prosperous Innkeeper + Primal Vigor

Nim Deathmantle

Ashnod's Altar

Prosperous Innkeeper

Primal Vigor

How it works

1. Activate Ashnod's Altar by sacrificing Prosperous Innkeeper, adding CC.
2. When Prosperous Innkeeper dies, Nim Deathmantle triggers, causing you to pay 4 to return Prosperous Innkeeper from your graveyard to the battlefield, and attach Nim Deathmantle to it.
3. When Prosperous Innkeeper enters the battlefield, it triggers, creating two Treasure artifact tokens.
4. Activate the Treasures by tapping and sacrificing them, adding 2.
5. Repeat.

This clever loop uses Ashnod's Altar to turn sacrifice into raw mana, fueling the revival cost of Nim Deathmantle whenever a creature hits the graveyard. While the steps focus on the loop itself, Primal Vigor does the heavy lifting of doubling the token output, turning the single entry of Prosperous Innkeeper into an overabundance of Treasure tokens. With those doubled treasures providing the exact amount of mana needed to pay for the Deathmantle's trigger, you can sustain the cycle indefinitely while generating endless life and sacrifice triggers.