Progenitor Mimic + Timestream Navigator

Mana needed: {2}{U}{U} each turn

GU identity

Commander legal

The 2 combo pieces

• Progenitor Mimic
• Timestream Navigator

What must be in place

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

How to execute it

1. At the beginning of your upkeep, Progenitor Mimic triggers, creating a copy of Timestream Navigator.
2. Activate the ability of any Timestream Navigator that has not entered this turn by paying {2}{U}{U}, tapping it, and putting it on the bottom of your library, taking an extra turn after this one.
3. Repeat each turn.

What the combo produces

• Infinite turns
• Lock