Saheeli, Sublime Artificer, Venser, the Sojourner, Mirror of Fate, and Part the Waterveil

Prerequisites

• Saheeli, Sublime Artificer on the battlefield
• Venser, the Sojourner on the battlefield
• Mirror of Fate on the battlefield
• Part the Waterveil in hand
• Saheeli has at least three loyalty counters
• each turn available

Steps

1. Cast Part the Waterveil by paying
2. Saheeli triggers, creating a 1/1 Servo artifact creature token
3. Resolve Part the Waterveil, causing you to take an extra turn after this one and exile it
4. Activate Saheeli by removing two loyalty counters from it, causing the Servo to become a copy of Mirror of Fate until end of turn
5. Activate the Servo by tapping and sacrificing it, choosing Part the Waterveil 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 Part the Waterveil being the top most card
6. If Saheeli has less than three loyalty counters on it, activate Venser's first loyalty ability by putting two loyalty counters on it, exiling Saheeli until your next end step
7. At the beginning of your end step, if you activated Venser's ability, Venser triggers, returning Saheeli from exile to the battlefield
8. Move to your next turn, drawing Part the Waterveil during your draw step
9. Repeat

Results

• Infinite turns