Requires

Extus, Oriq Overlord // Awaken the Blood Avatar must be on the battlefield. Dualcaster Mage must be in hand. Burnt Offering must be in hand. Altar of Dementia must be on the battlefield. You control at least one creature with mana value 3 or greater. Mana needed:

Steps

1. Cast Burnt Offering by paying and sacrificing a creature with mana value 3 or greater.
2. Extus triggers, targeting any applicable creature card in your graveyard.
3. Holding priority, cast Dualcaster Mage by paying .
4. When Dualcaster Mage enters the battlefield, it triggers.
5. Holding priority, activate Altar of Dementia by sacrificing Dualcaster Mage, causing target player to mill cards equal to Dualcaster Mage's power.
6. Resolve the Dualcaster Mage trigger, copying Burnt Offering.
7. Extus triggers, returning Dualcaster Mage to your hand from your graveyard.
8. Resolve the Burnt Offering copy, adding at least .
9. Repeat from step 3.
10. If the sacrificed creature had mana value 4 or greater, this combo nets infinite black and red mana.

Results