There's really only one way to do it right
Baymax, Personal Healthcare Companion Enchanted Rare, 218/204 The characters from Big Hero 6 are well represented in the Azurite Sea set, with each of them having multiple incarnations, representing their civilian and heroic alter ego forms
Even if only Revival Trance is left, its still a decent deal as long as you want the deck
Buy Set Boosters to maximize your chances of pulling rare and valuable cards
Scapeshift in particular has been pushed to more than 60 cards sometimes just to make the mana work when needing to fit too many Mountains into its manabase
If I only opened Gisela, of course, it'd be even worse, since she's by far the cheaper part of this duo ($5.50, compared to Gisela's hefty $33 price tag)