Activate Mystic Sanctuary and Lavabrink Floodgates by tapping them, adding 2.
Cast Ghostly Flicker either from your hand or from the top of your library by paying 2, blinking Mystic Sanctuary and Lavabrink Floodgates.
When Mystic Sanctuary enters untapped, it triggers, putting Ghostly Flicker from your graveyard onto the top of your library.
Repeat.
This clever loop lets you endlessly recur Ghostly Flicker to blink both Lavabrink Floodgates and Mystic Sanctuary. Every time the land re-enters the battlefield untapped, its triggered ability swoops in to place Ghostly Flicker right back on top of your library, waiting to be redrawn or played. Meanwhile, Lavabrink Floodgates acts as a dual-mana power source, and The Lunar Whale provides the crucial top-deck permission needed to cast the instant straight from the top of your library to keep the chain unbroken.