Altar of Dementia + Dualcaster Mage + Encroaching Mycosynth + Scrap Mastery

Mana needed: {4}{R}{R}{R}{R}

UR identity

Commander legal

The 4 combo pieces

How to execute it

  1. Cast Scrap Mastery by paying {3}{R}{R}.
  2. In response, cast Dualcaster Mage by paying {1}{R}{R}.
  3. Dualcaster Mage enters the battlefield, copying Scrap Mastery.
  4. Activate Altar of Dementia by sacrificing Dualcaster Mage, causing any player to mill two cards.
  5. Resolve a copy of Scrap Mastery, swapping all nonland permanents you control with all nonland permanents in your graveyard.
  6. Repeat from step 3.

What the combo produces