River Song + Conjurer's Bauble + Salvaging Station + Time Stretch

River Song

Conjurer's Bauble

Salvaging Station

Time Stretch

How it works

1. If Conjurer's Bauble is in your graveyard, activate Salvaging Station by tapping it, returning Conjurer's Bauble from your graveyard to the battlefield.
2. Cast Time Stretch by paying its mana cost, causing you to take two extra turns after this one.
3. Activate Conjurer's Bauble by tapping and sacrificing it, putting Time Stretch onto the bottom of your library from your graveyard, and then causing you to draw Time Stretch from the bottom of your library due to River Song.
4. Repeat during your second extra turn.