Saheeli, Sublime Artificer, Mirror of Fate, and Karn's Temporal Sundering

Prerequisites

• Saheeli, Sublime Artificer on the battlefield
• Mirror of Fate on the battlefield
• Karn's Temporal Sundering in hand
• each odd-numbered turn, with available each even-numbered turn available

Steps

1. Cast Karn's Temporal Sundering by paying
2. Saheeli triggers, creating a 1/1 Servo artifact creature token
3. Resolve Karn's Temporal Sundering, causing you to take an extra turn after this one, return Saheeli from the battlefield to your hand if Saheeli has fewer than three loyalty counters, and exile Karn's Temporal Sundering
4. Cast Saheeli by paying if it's in your hand
5. Activate Saheeli by removing two loyalty counters from it, causing the Servo to become a copy of Mirror of Fate until end of turn
6. Activate the Servo by tapping and sacrificing it, choosing Karn's Temporal Sundering and up to six other cards face up in exile, then exiling your library and putting the chosen cards on top of your library, with Karn's Temporal Sundering being the top most card
7. Move to your next turn, drawing Karn's Temporal Sundering during your draw step
8. Repeat

Results

• Infinite turns