Altar of Dementia + Cathodion + Underworld Breach

R identity

Commander legal

The 3 combo pieces

• Altar of Dementia
• Cathodion
• Underworld Breach

How to execute it

1. Activate Altar of Dementia by sacrificing Cathodion.
2. Cathodion triggers, adding {C}{C}{C}.
3. Resolve the Altar of Dementia ability, causing yourself to mill cards equal to Cathodion's power.
4. Cast Cathodion from your graveyard for its escape cost by paying {3} and exiling three cards from your graveyard.
5. Repeat.

What the combo produces

• Infinite self-mill
• Near-infinite creature sacrifice triggers
• Near-infinite death triggers
• Near-infinite ETB
• Near-infinite LTB
• Near-infinite storm count