Nim Deathmantle + Ashnod's Altar + Phyrexian Triniform

Nim Deathmantle

Ashnod's Altar

Phyrexian Triniform

How it works

1. Activate Ashnod's Altar by sacrificing Phyrexian Triniform, adding CC.
2. When Phyrexian Triniform dies, it and Nim Deathmantle trigger,
3. Resolve the Phyrexian Triniform trigger, creating three creature tokens.
4. Holding priority, activate Ashnod's Altar by sacrificing a creature token, adding CC.
5. Resolve the Nim Deathmantle trigger, causing you to pay 4 to return Phyrexian Triniform from your graveyard to the battlefield and attach Nim Deathmantle to it.
6. Repeat.