Time Sieve, Biotransference, Maskwood Nexus, and Xathrid Necromancer

Prerequisites

• Time Sieve on the battlefield
• Biotransference on the battlefield
• Maskwood Nexus on the battlefield
• Xathrid Necromancer on the battlefield
• You control at least five other creatures

Steps

1. Activate Time Sieve by tapping it and sacrificing five creatures
2. Xathrid Necromancer triggers five times, creating five 2/2 Zombie creature tokens
3. Resolve the Time Sieve ability, causing you to take an extra turn after this one
4. Repeat each turn

Results

• Infinite turns