Progenitor Mimic + Scholar of the Ages + Walk the Aeons Combo

All cards on the battlefield.

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

Cast Walk the Aeons by paying its mana cost, taking an extra turn after this one.

At the beginning of your next upkeep, Progenitor Mimic triggers, creating a token copy of Scholar of the Ages.

When the token Scholar of the Ages enters the battlefield, it triggers itself, returning Walk the Aeons and up to one additional target instant or sorcery card from your graveyard to your hand.

Repeat.

Infinite turns

Lock