Encroaching Mycosynth, Dualcaster Mage, Scrap Mastery, and Altar of Dementia

Prerequisites

• Encroaching Mycosynth on the battlefield
• Dualcaster Mage in hand
• Scrap Mastery in hand
• Altar of Dementia on the battlefield
• available

Steps

1. Cast Scrap Mastery by paying
2. In response, cast Dualcaster Mage by paying
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

Results

• Infinite blinking of nonland permanents in graveyard or library or on the battlefield
• Infinite death triggers
• Infinite ETB
• Infinite LTB
• Infinite magecraft triggers
• Infinite mill
• Infinite sacrifice triggers
• Infinite self-mill