Mikaeus, the Unhallowed + Canker Abomination + Thermopod

Mikaeus, the Unhallowed

Canker Abomination

Thermopod

How it works

1. Activate Thermopod by sacrificing Canker Abomination, adding .
2. When Canker Abomination dies, its undying ability triggers, returning it from your graveyard to the battlefield with a +1/+1 counter on it.
3. When Canker Abomination enters the battlefield, it triggers, putting a number of -1/-1 counters on it equal to the number of creatures an opponent controls.
4. If the opponent had seven or more creatures, Canker Abomination will die as a state-based action due to having 0 or less toughness. If this occurs, repeat steps 2 through 4 infinitely.
5. Otherwise, repeat from step 1.