Rendmaw, Creaking Nest + Nim Deathmantle + Ashnod's Altar

Rendmaw, Creaking Nest

Nim Deathmantle

Ashnod's Altar

How it works

1. Activate Ashnod's Altar by sacrificing Rendmaw, adding CC.
2. When Rendmaw dies, Nim Deathmantle triggers, causing you to pay 4 to return Rendmaw from your graveyard to the battlefield, and attach Nim Deathmantle to it.
3. When Rendmaw enters the battlefield, it triggers, causing each player to create a tapped 2/2 Bird creature token.
4. Activate Ashnod's Altar by sacrificing the Bird, adding CC.
5. Repeat.

This loop turns Ashnod's Altar into an engine that continuously recycles your commander by leveraging Nim Deathmantle's resurrection trigger. Whenever Rendmaw, Creaking Nest is sacrificed for two mana, the Deathmantle lets you pay four mana to bring it right back to the battlefield, which conveniently refunds half that cost by providing an opponent-goading Bird token for the Altar to sacrifice next. By repeatedly feeding Rendmaw and the resulting tokens into Ashnod's Altar, you generate an infinite stream of enter-the-battlefield, death, and sacrifice triggers while flooding the board with tapped opponents' tokens.