River Song + Timestream Navigator

Mana needed: {3}{U}{U}{U} each turn

UR identity

Commander legal

The 2 combo pieces

• River Song
• Timestream Navigator

What must be in place

Timestream Navigator does not have summoning sickness.
You have the city's blessing.

How to execute it

1. During your upkeep, activate Timestream Navigator by paying {2}{U}{U}, 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 {1}{U}.
4. Repeat each turn.

What the combo produces

• Infinite turns
• Lock