Time Vault, and Derevi, Empyrial Tactician

Prerequisites

• Time Vault on the battlefield
• Derevi, Empyrial Tactician on the battlefield
• Derevi does not have summoning sickness
• Opponents can not block Derevi

Steps

1. Attack with Derevi
2. Derevi triggers upon dealing combat damage, untapping Time Vault
3. Tap Time Vault to take an extra turn after this one
4. Repeat for infinite turns

Results

• Infinite turns