This clever loop sets up an infinite recursion of spells and triggers by continuously recycling its own pieces right out of the graveyard. Once you have enough lands to fuel the engine, Turnabout untaps all your lands to keep the mana flowing freely. Meanwhile, Ghostly Flicker whisks away both Skullwinder and Scrivener, letting their entry triggers pull Turnabout and Ghostly Flicker right back to your hand to do it all over again.