Turnabout + Ghostly Flicker + Scrivener + Shipwreck Dowser

Turnabout

Ghostly Flicker

Scrivener

Shipwreck Dowser

How it works

1. Activate any number of lands you control by tapping them, adding at least 4.
2. Cast Turnabout by paying 2, untapping all lands you control.
3. Cast Ghostly Flicker by paying 2, blinking Shipwreck Dowser and Scrivener.
4. When Shipwreck Dowser and Scrivener enter the battlefield, they trigger, returning Turnabout and Ghostly Flicker from your graveyard to your hand.
5. Repeat.

This clever loop leverages the recursive power of Ghostly Flicker to constantly reset your graveyard and mana supply. By targeting both Shipwreck Dowser and Scrivener with the flicker, their entry triggers allow you to pull Ghostly Flicker and Turnabout right back out of the graveyard and into your hand. Meanwhile, Turnabout serves as the engine's powerhouse, untapping all your lands to completely refund the mana spent on casting your spells and keeping the chain going indefinitely.