Altar of Dementia + Cayth, Famed Mechanist + Eirdu, Carrier of Dawn // Isilu, Carrier of Twilight

WUBR identity

Commander legal

The 3 combo pieces

• Altar of Dementia
• Cayth, Famed Mechanist
• Eirdu, Carrier of Dawn // Isilu, Carrier of Twilight

How to execute it

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

What the combo produces

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