Mikaeus, the Unhallowed, Canker Abomination, and Altar of Dementia

Prerequisites

• Mikaeus, the Unhallowed on the battlefield
• Canker Abomination on the battlefield
• Altar of Dementia on the battlefield
• undefined

Steps

1. Activate Altar of Dementia by sacrificing Canker Abomination
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
5. If this occurs, repeat steps 2 through 4 infinitely
6. Otherwise, resolve the Altar of Dementia ability, and repeat from step 1

Results

• Infinite LTB
• Infinite ETB
• Infinite sacrifice triggers
• Infinite death triggers
• Infinite mill
• Infinite self-mill