Nim Deathmantle + Ashnod's Altar + Prosperous Innkeeper + Goldspan Dragon

Nim Deathmantle

Ashnod's Altar

Prosperous Innkeeper

Goldspan Dragon

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 a Treasure artifact token.
4. Activate the Treasure by tapping and sacrificing it, adding 2.
5. Repeat.

This clever loop relies on Ashnod's Altar to continuously sacrifice Prosperous Innkeeper for mana, which then funds the revival trigger provided by Nim Deathmantle to bring the Innkeeper right back to the battlefield. Because Goldspan Dragon doubles the mana output of the Treasure tokens created by Prosperous Innkeeper's entry, you easily generate the surplus mana needed to sustain the loop indefinitely. As this cycle repeats, the constant entering and dying of creatures floods your board with infinite sacrifice, entry, and death triggers while safely padding your life total.