Turnabout + Ghostly Flicker + Scrivener + Greenwarden of Murasa

Turnabout

Ghostly Flicker

Scrivener

Greenwarden of Murasa

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

This elegant loop leverages the enter-the-battlefield abilities of both Greenwarden of Murasa and Scrivener to continuously recycle your spells, with Scrivener pulling back the instant Turnabout and Greenwarden of Murasa returning the sorcery Ghostly Flicker. Once Ghostly Flicker blinks both creatures back into play, their triggers reset to hand you the exact same two spells right back from the graveyard. Meanwhile, Turnabout acts as the engine's financial backer by untapping your lands so you can generate more than enough mana to cast everything again, leaving you with infinite mana and endless spell-casting triggers.