There are some interesting staples here, with a lot more options from Fabled than the Amber and Sapphire deck, especially the options from A Goofy Movie
Decks are still limited to just two colors, meaning he can only be played in a deck containing Amethyst, Sapphire, or Amethyst/Sapphire cards
However, its in Arthurs ability that he truly shines: when played, he can give a chosen character Challenger +2 and Resist +2 (that means they get +2 Strength while Challenging and a reduction of 2 damage thats being dealt to them), plus they can also challenge Ready, not Exerted, characters on the same turn too
#3 Emerald/Sapphire Another deck thats showing some early promise is the Emerald/Sapphire Control deck
Equipped creature gets +2/+1