Progenitor Mimic + Returned Pastcaller + Walk the Aeons

RGWU identity

Commander legal

The 3 combo pieces

• Progenitor Mimic
• Returned Pastcaller
• Walk the Aeons

What must be in place

Enough mana available to cast the extra turn spell each turn.
Progenitor Mimic is a copy of Returned Pastcaller.

How to execute it

1. Cast Walk the Aeons by paying its mana cost, taking an extra turn after this one.
2. At the beginning of your next upkeep, Progenitor Mimic triggers, creating a token copy of Returned Pastcaller.
3. When the token Returned Pastcaller enters the battlefield, it triggers itself, returning Walk the Aeons from your graveyard to your hand.
4. Repeat.

What the combo produces

• Infinite turns
• Lock