1Activate Ashnod's Altar by sacrificing Armada Wurm, adding .
2Armada Wurm dies, triggering Nim Deathmantle, causing you to pay to return Armada Wurm from your graveyard to the battlefield, and attach Nim Deathmantle to it.
3Armada Wurm enters the battlefield, creating a 5/5 Wurm creature token.
4Activate Ashnod's Altar by sacrificing the Wurm, adding .