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

Prerequisites

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Steps

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

Effects

• Infinite blinking of nonland permanents and nonland permanent cards in graveyard and in library
• Infinite creature ETB
• Infinite creature LTB
• Infinite creature sacrifice triggers
• Infinite death triggers
• Infinite magecraft triggers
• Infinite mill
• Infinite self-mill