The card has three willpower and three health, with the opportunity to quest for one lore: which is all very standard stuff
Of course, they have to keep in mind the limit on legendary cards and that most creatures can't attack or tap until their next turn, but it's still a pretty powerful card
I know this is different than duplicating, though I admit I'm not 100% sure of the difference, other than to differentiate certain effects.
There are plenty of fantastic lifegain payoffs, most notably the Vito, Thorn Of The Dusk Rose and Exquisite Blood combo
That basically means if players saw it pack one, pick one, they took it there and then
It depends on what kind of decks are available to slot it into, but Id be shocked if it was anything less than just good