River Song, Conjurer's Bauble, Emry, Lurker of the Loch, and Walk the Aeons

Prerequisites

• River Song on the battlefield
• Conjurer's Bauble on the battlefield or in the graveyard
• Emry, Lurker of the Loch on the battlefield
• Walk the Aeons in hand
• plus enough mana to cast the extra turn spell each turn available

Steps

1. If Conjurer's Bauble is in your graveyard, activate Emry by tapping it, targeting Conjurer's Bauble
2. Then, cast Conjurer's Bauble from your graveyard by paying
3. Cast Walk the Aeons by paying its mana cost, causing you to take an extra turn after this one
4. Activate Conjurer's Bauble by tapping and sacrificing it, putting Walk the Aeons onto the bottom of your library from your graveyard, and then causing you to draw Walk the Aeons from the bottom of your library due to River Song
5. Repeat each turn

Results

• Infinite turns