title: Power Nine
context: The Power Nine are considered to be among the most powerful cards in the game. All nine cards are of the rarest level of rarity and were printed only in the Alpha, Beta, and Unlimited sets in late 1993 to early 1994.[3] Currently, all of the Power Nine cards are restricted in the Vintage tournament format[4] and banned in Legacy,[5] the only tournament formats where they would be legal otherwise, and all except for Timetwister are banned in the Commander format.[6]
question: What's the rarest Magic card in existence?
answers: Power Nine