Love the artwork, for starters. Beaut. As for the card, good HP, great ability (free attachments are always good!), low energy requirements for great attacks (both reg & GX), and a Fairy to boot!
This'll be a useful thing to look at as I try to build a deck dedicated to Fairies. Low & behold, until Sylveon, the only top Fairy decks since rotation don't really focus on their "fairiness" that much (M Gar needs Shaymin, Hoopa, ect; Rainbow Xerneas needs all the types). It'll be fun to try and build a true Fairy deck again. :3
Also, for anyone complaining about another Gardevoir: I could understand that sentiment... if it weren't a fairy type. New Flash: there's only 4 different stage 2 Fairy types in existence: Gardevoir, Florges, Primarina, And Togekiss. The other 3-evo-line Fairies from the games are Stage 1s in the TCG due to baby forms. Not a lot to choose from.