Time Sieve, Encroaching Mycosynth, Rotlung Reanimator, and Maskwood Nexus

Prerequisites

• Time Sieve on the battlefield
• Encroaching Mycosynth on the battlefield
• Rotlung Reanimator on the battlefield
• Maskwood Nexus on the battlefield
• You control at least five other creatures

Steps

1. Activate Time Sieve by tapping it and sacrificing five other creatures
2. When the creatures die as Clerics due to Maskwood Nexus, Rotlung Reanimator triggers five times, creating five 2/2 Zombie creature tokens
3. Resolve the Time Sieve ability, causing you to take an extra turn after this one
4. Repeat each turn

Results

• Infinite turns