Altar of Dementia + Grim Poppet + Mikaeus, the Unhallowed

B identity

Commander legal

The 3 combo pieces

• Altar of Dementia
• Grim Poppet
• Mikaeus, the Unhallowed

How to execute it

1. Activate Altar of Dementia by sacrificing Grim Poppet.
2. When Grim Poppet dies, its undying ability triggers, returning it from your graveyard to the battlefield without a +1/+1 counter on it due to its replacement effect.
3. Resolve the Altar of Dementia ability
4. Repeat.

What the combo produces

• Infinite -1/-1 counters
• Infinite creature LTB
• Infinite death triggers
• Infinite ETB
• Infinite mill
• Infinite sacrifice triggers
• Infinite self-mill