Altar of Dementia + Mikaeus, the Unhallowed + The Reaper, King No More

BRG identity

Commander legal

The 3 combo pieces

• Altar of Dementia
• Mikaeus, the Unhallowed
• The Reaper, King No More

How to execute it

1. Activate Altar of Dementia by sacrificing The Reaper.
2. When The Reaper dies, its undying ability triggers, returning it from your graveyard to the battlefield with a +1/+1 counter on it.
3. When The Reaper enters the battlefield, it triggers, putting a -1/-1 counter on it.
4. Resolve the Altar of Dementia ability
5. Repeat.

What the combo produces

• Infinite -1/-1 counters
• Infinite creature LTB
• Infinite death triggers
• Infinite ETB
• Infinite mill
• Infinite recursion of non-Human creatures you control
• Infinite sacrifice triggers
• Infinite self-mill