Altar of Dementia + Dualcaster Mage + Encroaching Mycosynth + Open the Vaults

Mana needed: {5}{R}{R}{W}{W}

URW identity

Commander legal

The 4 combo pieces

• Altar of Dementia
• Dualcaster Mage
• Encroaching Mycosynth
• Open the Vaults

How to execute it

1. Cast Open the Vaults by paying {4}{W}{W}.
2. In response, cast Dualcaster Mage by paying {1}{R}{R}.
3. Dualcaster Mage enters the battlefield, copying Open the Vaults.
4. Activate Altar of Dementia by sacrificing Dualcaster Mage, causing any player to mill two cards.
5. Resolve a copy of Open the Vaults, returning all nonland permanent cards from your graveyard to the battlefield.
6. Repeat from step 3.

What the combo produces

• Infinite creature LTB
• Infinite death triggers
• Infinite ETB
• Infinite magecraft triggers
• Infinite mill
• Infinite sacrifice triggers
• Infinite self-mill
• Put all nonland permanents in your graveyard and library onto the battlefield