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
• Tana has power five or greater, does not have summoning sickness and cannot be blocked by an opponent

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