Ashnod's Altar + Keiga, the Tide Star + Nim Deathmantle

U identity

Commander legal

The 3 combo pieces

• Ashnod's Altar
• Keiga, the Tide Star
• Nim Deathmantle

How to execute it

1. Whenever an opponent controls a creature, activate Ashnod's Altar by sacrificing Keiga, adding {C}{C}.
2. When Keiga dies, it and Nim Deathmantle trigger.
3. Resolve the Keiga trigger, causing you to gain control of a creature an opponent controls.
4. Activate Ashnod's Altar by sacrificing the creature you gained control of in step 3, adding {C}{C}.
5. Resolve the Nim Deathmantle trigger from step 2, causing you to pay {4} to return Keiga from your graveyard to the battlefield, and attach Nim Deathmantle to it.
6. Repeat as desired and/or whenever a creature enters the battlefield under an opponent's control.

What the combo produces

• Gain control of all creatures opponents control and sacrifice them
• Gain control of any creatures that enters the battlefield
• Lock