Eternal Witness + Progenitor Mimic + Time Stretch

Mana needed: {8}{U}{U} each turn

GU identity

Commander legal

The 3 combo pieces

• Eternal Witness
• Progenitor Mimic
• Time Stretch

What must be in place

Progenitor Mimic is a copy of Eternal Witness.

How to execute it

1. Cast Time Stretch by paying {8}{U}{U}, taking two extra turns after this one.
2. At the beginning of your next upkeep, Progenitor Mimic triggers, creating a token copy of Eternal Witness.
3. When the token Eternal Witness enters the battlefield, it triggers itself, returning Time Stretch from your graveyard to your hand.
4. Repeat.

What the combo produces

• Infinite turns
• Lock