Ruby/Amethyst and Emerald/Steel are both great color combos, so these may well be easy to upgrade
Then Magic Academy events at your local game store are perfect for you
These dual-ink cards require a certain combination of inks in a deck to use, but can bring strong abilities to a game when played, thereby creating some new ideas of meta decks for players
Anna - Mystical Majesty , meanwhile, can use Exceptional Power to exert all opposing characters, which works great with Olaf - Happy Passenge r, since that card's Clear the Path ability means paying 1 less Ink per every opponent's exerted characters
4 Ursula - Sea Witch Queen 208/204, Amethyst It's a bit of a shame that Ursula doesn't manage to top her own themed Ursula's Return expansion in value, but she comes close enough to it