Time Sieve, Encroaching Mycosynth, Kiki-Jiki, Mirror Breaker, and Abhorrent Overlord

Prerequisites

• Time Sieve on the battlefield
• Encroaching Mycosynth on the battlefield
• Kiki-Jiki, Mirror Breaker on the battlefield
• Abhorrent Overlord on the battlefield

Steps

1. Activate Kiki-Jiki by tapping it, creating a token copy of Abhorrent Overlord with haste
2. When the Abhorrent Overlord token enters the battlefield, it triggers, creating at least four 1/1 Harpy creature tokens
3. Activate Time Sieve by tapping it, sacrificing the Abhorrent Overlord token and the Harpy tokens, causing you to take an extra turn after this one
4. Repeat each turn

Results

• Infinite turns