Old One Eye + Nim Deathmantle + Ashnod's Altar

Old One Eye

Nim Deathmantle

Ashnod's Altar

How it works

1. Activate Ashnod's Altar by sacrificing Old One Eye, adding CC.
2. Old One Eye dies, triggering Nim Deathmantle, causing you to pay 4 to return Old One Eye from your graveyard to the battlefield, and attach Nim Deathmantle to it.
3. When Old One Eye enters the battlefield, it triggers, creating a 5/5 Tyranid creature token.
4. Activate Ashnod's Altar by sacrificing the Tyranid, adding CC.
5. Repeat.