Eirdu, Carrier of Dawn // Isilu, Carrier of Twilight + Altar of Dementia + Angel of Invention

Eirdu, Carrier of Dawn // Isilu, Carrier of Twilight

Altar of Dementia

Angel of Invention

How it works

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

This recursive loop hinges on the dual-faced nature of Eirdu, Carrier of Dawn // Isilu, Carrier of Twilight, whose backside grants persist to your other nontoken creatures. When you feed Angel of Invention to Altar of Dementia, its persist ability brings it right back from the graveyard, offset nicely by the +1/+1 counters from its fabricate ability to repeatedly clear away the -1/-1 counters and keep the chain going. Because Angel of Invention enters the battlefield over and over again, you can mill out any opponent's entire library using Altar of Dementia's sacrifice mill effect.