Cast Time Stretch by paying its mana cost, causing you to take two extra turns after this one.
Move to your first extra turn.
Activate Mystic Sanctuary by tapping it, adding .
Cast Ghostly Flicker by paying 2, blinking Mystic Sanctuary and Pinnacle Monk // Mystic Peak.
When Pinnacle Monk // Mystic Peak and Mystic Sanctuary enter the battlefield, they trigger.
Resolve the Pinnacle Monk // Mystic Peak trigger, returning Ghostly Flicker from your graveyard to your hand.
Resolve the Mystic Sanctuary trigger, putting Time Stretch from your graveyard onto the top of your library.
Move to your next turn, drawing Time Stretch during your draw step.
Repeat.
This clever engine achieves infinite turns by looping **Time Stretch** right back into your hand and library to be cast turn after turn. The key to sustaining this loop is **Ghostly Flicker**, which resets both **Pinnacle Monk // Mystic Peak** and **Mystic Sanctuary** simultaneously upon entry. When they re-enter, **Pinnacle Monk // Mystic Peak** plucks **Ghostly Flicker** straight out of your graveyard, while **Mystic Sanctuary** (fueled by your island count) sets up **Time Stretch** on top of your library so you can just draw it and go again.