Tana, the Bloodsower, Time Sieve, and Encroaching Mycosynth

Prerequisites

• Tana, the Bloodsower on the battlefield
• Time Sieve on the battlefield
• Encroaching Mycosynth on the battlefield

Steps

1. Deal combat damage to an opponent using Tana
2. Tana triggers, creating at least five 1/1 Saproling creature tokens
3. Activate Time Sieve by tapping it and sacrificing five Saprolings, causing you to take an extra turn after this one
4. Repeat each turn

Results

• Infinite turns