River Song + Conjurer's Bauble + Prototype Portal + Temporal Manipulation

River Song

Conjurer's Bauble

Prototype Portal

Temporal Manipulation

How it works

1. Activate Prototype Portal by paying 1 and tapping it, 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.