They're obviously kidding! There is no other rational explanation to this thing! I'm sorry, 1 mana, locks down Dredge, Reanimator, GSZ, Natural Order, and so many other tactics? Dredge can't keep up with it, it needs 2 lands and 1 Ancient Grudge in hand, provided the opponent doesn't have a counterspell.
I used to make jokes about people complaining that WoTC hate combos, but then I took a Grafdigger's Cage to the knee. It's just wrong.