Timestream Navigator, and Grenzo, Dungeon Warden

Prerequisites

• Timestream Navigator on the battlefield
• Grenzo, Dungeon Warden on the battlefield
• You have the city's blessing
• Timestream Navigator does not have summoning sickness
• each turn available

Steps

1. Tap Timestream Navigator to take an extra turn, putting it on the bottom of your library
2. Activate Grenzo to return Timestream Navigator to the battlefield
3. Move to your next turn
4. Repeat for infinite turns

Results

• Infinite turns