Opening Ceremony [Unfinity]

Set: Unfinity Type: Sorcery Rarity: Mythic Cost: {4}{R}{R} Add {W}{U}{B}{R}{G}{C}. You may open a sealed Magic booster pack. Until end of turn, you may cast spells from among the cards in that booster pack. “Oooooh!” —The crowd “Aaaaaaaaah!” —Also the crowd