Nim Deathmantle + Ashnod's Altar + Lazotep Reaver

Nim Deathmantle

Ashnod's Altar

Lazotep Reaver

How it works

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