Color Identity: U

Initial Card State
- All permanents on the battlefield.
Steps
- Whenever an opponent controls a creature, activate Ashnod's Altar by sacrificing Keiga, adding ({C} magic symbol)
({C} magic symbol)
. - When Keiga dies, it and Nim Deathmantle trigger.
- Resolve the Keiga trigger, causing you to gain control of a creature an opponent controls.
- Activate Ashnod's Altar by sacrificing the creature you gained control of in step 3, adding ({C} magic symbol)
({C} magic symbol)
. - Resolve the Nim Deathmantle trigger from step 2, causing you to pay ({4} magic symbol)
to return Keiga from your graveyard to the battlefield, and attach Nim Deathmantle to it. - Repeat as desired and/or whenever a creature enters the battlefield under an opponent's control.
Results
- Gain control of all creatures opponents control and sacrifice them.
- Gain control of any creatures that enters the battlefield.
Bracket Tag
This combo has been estimated to be Spicy (Bracket 3-4+).