Time Sieve, Mycosynth Lattice, Conspiracy, and Xathrid Necromancer

Prerequisites

• Time Sieve on the battlefield
• Mycosynth Lattice on the battlefield
• Conspiracy on the battlefield
• Xathrid Necromancer on the battlefield
• You control at least five other creatures
• "Human" chosen with Conspiracy

Steps

1. Activate Time Sieve by tapping it and sacrificing five creatures
2. The creatures die, triggering Xathrid Necromancer 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