How it works
Steps
- 1Cast Open the Vaults by paying .
- 2In response, cast Dualcaster Mage by paying .
- 3Dualcaster Mage enters the battlefield, copying Open the Vaults.
- 4Activate Altar of Dementia by sacrificing Dualcaster Mage, causing any player to mill two cards.
- 5Resolve a copy of Open the Vaults, returning all nonland permanent cards from your graveyard to the battlefield.
- 6Repeat from step 3.
Commander brackets
In which brackets is this combo allowed, per Spellbook's Exhibition tier?