Cast Temporal Manipulation by paying ({3} magic symbol) ({U} magic symbol) ({U} magic symbol) , causing you to take an extra turn after this one.
Move to your combat phase, and declare Ardent Dustspeaker as an attacker.
Ardent Dustspeaker triggers, causing you to put Temporal Manipulation on the bottom of your library from your graveyard, then exile the top two cards of your library with the ability to play them this turn.
Move to your next turn, drawing Temporal Manipulation from the bottom of your library due to River Song during your draw step.