Nim Deathmantle + Ashnod's Altar + Nest Invader

Nim Deathmantle

Ashnod's Altar

Nest Invader

How it works

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