Cast Capture of Jingzhou by paying its mana cost, causing you to take an extra turn after this one.
Cast Ghostly Flicker by paying 2, blinking Mystic Sanctuary and Eternal Witness.
When Eternal Witness and Mystic Sanctuary enter the battlefield, they trigger.
Resolve the Eternal Witness trigger, returning Ghostly Flicker from your graveyard to your hand.
Resolve the Mystic Sanctuary trigger, putting Capture of Jingzhou from your graveyard onto the top of your library.
Move to your next turn, drawing Capture of Jingzhou during your draw step.
Repeat.
This brilliant loop locks down the game by chaining infinite turns, fueled entirely by recycling your resources. By casting Capture of Jingzhou, you earn an extra turn, while Ghostly Flicker resets your board by blinking both Eternal Witness and Mystic Sanctuary. Each time they re-enter, Eternal Witness reaches into your graveyard to retrieve your Ghostly Flicker, and Mystic Sanctuary's landfall-style ability neatly places Capture of Jingzhou right back on top of your library to draw on your next turn.