River Song, Conjurer's Bauble, Mechanized Production, and Temporal Manipulation

Prerequisites

• River Song on the battlefield
• Conjurer's Bauble on the battlefield
• Mechanized Production on the battlefield
• Temporal Manipulation in hand

Steps

1. At the beginning of your upkeep, Mechanized Production triggers, creating a token copy of Conjurer's Bauble
2. Cast Temporal Manipulation by paying its mana cost, causing you to take an extra turn after this one
3. Activate the Conjurer's Bauble token by tapping and sacrificing it, putting Temporal Manipulation onto the bottom of your library from your graveyard, and then causing you to draw Temporal Manipulation from the bottom of your library due to River Song
4. Repeat each turn

Results

• Infinite turns