Mirror of Fate, Aetherflux Reservoir, Rest in Peace, and Gwenom, Remorseless

Prerequisites

• Mirror of Fate on the battlefield
• Aetherflux Reservoir on the battlefield
• Rest in Peace on the battlefield
• Gwenom, Remorseless on the battlefield

Steps

1. Activate Mirror of Fate by tapping it and exiling it due to Rest in Peace, choosing Mirror of Fate and up to six other cards from exile, then exiling your library and putting the chosen cards on top of your library, ensuring to place Mirror of Fate on top of your library
2. Cast Mirror of Fate from the top of your library by paying 5 life due to Gwenom
3. Aetherflux Reservoir triggers, causing you to gain 1 life for each spell you've cast this turn
4. Repeat

Results

• Cast all spells from your library and exile infinitely
• Infinite artifact ETB
• Infinite artifact LTB
• Infinite artifact sacrifice triggers
• Infinite damage
• Infinite lifegain
• Infinite lifegain triggers
• Infinite magecraft triggers
• Infinite storm count