Turnabout + Ghostly Flicker + Vampire Charmseeker + Scrivener

Turnabout

Ghostly Flicker

Vampire Charmseeker

Scrivener

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 Scrivener and Vampire Charmseeker.
4. When Scrivener and Vampire Charmseeker enter the battlefield, they trigger, returning Turnabout and Ghostly Flicker from your graveyard to your hand.
5. Repeat.

This elegant spell-recursion loop sets up an infinite engine using Ghostly Flicker to constantly reset your battlefield. When you blink Scrivener and Vampire Charmseeker, their entry triggers allow you to pull Ghostly Flicker and Turnabout right back out of your graveyard and into your hand. Meanwhile, Turnabout serves as the engine's fuel by untapping all your lands, generating a massive surplus of mana with every iteration to pay for your recurring spells.