There aren't many decks this planeswalker would call home. Admittedly, though, UR Delver and Dreadhorde Arcanist decks will settle for several copies of The Royal Scions.
Of course, a planeswalker that can't protect itself doesn't sound too intriguing. Its low mana cost and high loyalty count already make it well protected from aggro players.
This card's ultimate ability can be a great finisher, and it looks like getting there wouldn't be too troublesome.