Time Sieve, Encroaching Mycosynth, and Rapacious One

Prerequisites

• Time Sieve on the battlefield
• Encroaching Mycosynth on the battlefield
• Rapacious One on the battlefield
• Rapacious One does not have summoning sickness
• Rapacious One cannot be blocked by an opponent

Steps

1. Deal combat damage using Rapacious One
2. Rapacious One triggers, creating five 0/1 Eldrazi Spawn creature tokens
3. Activate Time Sieve by tapping it and sacrificing the Eldrazi Spawns, causing you to take an extra turn after this one
4. Repeat each turn

Results

• Infinite turns