Timesifter + Draco + Isochron Scepter + Pull from Eternity + Academy Ruins

Prerequisites

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Steps

1. 1Activate Isochron Scepter by paying and tapping it, casting a copy of Pull from Eternity without paying its mana cost.
2. 2Resolve the copy of Pull from Eternity, putting Draco into your graveyard from exile.
3. 3Activate Academy Ruins' second ability by paying and tapping it, putting Draco on top of your library from your graveyard.
4. 4Move to the next turn.
5. 5At 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.
6. 6Repeat.

Effects

• Infinite turns
• Lock