Rarity wise its probably close enough to fair BUT the Unickorn is VERY hard to trade of for anything more than the tribal you're offering so as long as you are aware that demand wise you're overpaying a tad and you aren't likely to get back the same value of what you traded then I'd say yes, rarity wise it looks alright. (But get a third opinion as I'm not too good with remembering 'gap worths' when I'm tired xD)