Magic: The Gathering Foundations Beginner Box Contents Learning to play Magic: The Gathering has never been easier
As a concept, the payoff is really just whatever your opponents are able to do with the help provided
The front side helps filter draws and fill the graveyard, while the flip side's -3 ability recasts instants or sorceries, providing repeated value
As well as gaining access to cards like Dryad Militant, Destiny Spinner, and Collector Ouphe, adding green can give you both ways to draw cards (Guardian Project, The Great Henge, Beast Whisperer) and search out what you need (Eladamris Call, Captain Sisay)
If Dark Confidant or some other way to run away with a game were included, I would not advocate cutting all the discard