Time Sieve, Encroaching Mycosynth, and Elemental Mastery

Prerequisites

• Time Sieve on the battlefield
• Encroaching Mycosynth on the battlefield
• Elemental Mastery on the battlefield
• Elemental Mastery attached to a creature you control that has power 5 or greater and that does not have summoning sickness

Steps

1. Activate the creature with Elemental Mastery attached by tapping it, creating at least five 1/1 Elemental creature tokens
2. Activate Time Sieve by tapping it and sacrificing five Elemental tokens, causing you to take an extra turn after this one
3. Repeat each turn

Results

• Infinite turns