Time Sieve, Encroaching Mycosynth, Delina, Wild Mage, and Phylath, World Sculptor

Prerequisites

• Time Sieve on the battlefield
• Encroaching Mycosynth on the battlefield
• Delina, Wild Mage on the battlefield
• Phylath, World Sculptor on the battlefield
• You control at least four basic lands
• Delina does not have summoning sickness and cannot be blocked and killed by an opponent

Steps

1. Declare Delina as an attacker
2. Delina triggers, creating at least one nonlegendary token copy of Phylath with haste
3. When the Phylath token enters the battlefield, its first ability triggers, creating at least four 0/1 Plant creature tokens
4. Activate Time Sieve by tapping it, sacrificing the Phylath token and the Plant tokens, causing you to take an extra turn after this one
5. Repeat each turn

Results

• Infinite turns