Draco and Pull from Eternity in exile (Pull from Eternity exiled by Isochron Scepter).
All other permanents on the battlefield.
({3} magic symbol) ({U} magic symbol) each turn available.
Steps
Activate Isochron Scepter by paying ({2} magic symbol) and tapping it, casting a copy of Pull from Eternity without paying its mana cost.
Resolve the copy of Pull from Eternity, putting Draco into your graveyard from exile.
Activate Academy Ruins' second ability by paying ({1} magic symbol) ({U} magic symbol) and tapping it, putting Draco on top of your library from your graveyard.
Move to the next turn.
At the beginning of that turn's upkeep, Timesifter triggers, exiling the top card of each player's library, and causing you to take an extra turn after this one due to exiling the highest mana value card.