River Song, and Timestream Navigator

Prerequisites

• River Song on the battlefield
• Timestream Navigator on the battlefield
• Timestream Navigator does not have summoning sickness
• You have the city's blessing
• each turn available

Steps

1. During your upkeep, activate Timestream Navigator by paying , tapping it and putting it on the bottom of your library, causing you to take an extra turn after this one
2. Move to your draw step, drawing Timestream Navigator from the bottom of your library due to River Song
3. Cast Timestream Navigator by paying
4. Repeat each turn

Results

• Infinite turns