With more than two-fifths of competitors running the same spell-heavy deck, slotting in Magebane made perfect sense
While the second and third abilities of Champions from Beyond have "Party" in their flavor words, neither of them refer to a player's party (a mechanic from previous releases that also uses the term "full party")
A transforming double-faced card enters with its front face up by default, unless a spell or ability instructs you to put it onto the battlefield transformed or allows you to cast it transformed, in which case it enters with its back face up
These allow you to heap auras onto one creature with little concern for your opponents removal
That will include a promo Gilded Lotus, and this should be a nicely priced card, considering the art and how theres no other borderless version
Playing this card then exerting a couple of items or Support characters could be an instant game-winner