It might seem expensive to keep up with, especially for players who prefer formats with frequent card rotations like Standard and Alchemy, but doing well in MTG Arena without making big purchases isn't just possible -- it's easy
That heuristic, whether you want to think of it as suits of cards or Hogwarts houses, dictates not only whether spells are, say, more defensive or more aggressive, more telepathic or more physical, but also the personalities of the characters wielding the magic and, to an extent, those of the players, who build their decks around one or two, and occasionally even more, of those colors
We have two werewolves that do just that: Daybreak Ranger and, yes, Ulrich of the Krallenhorde, but Gruul has tons of excellent cards that enable fighting like Ulvenwald Tracker and the new Domri, Anarch of Bolas
It retains pure Psychic typing but becomes an almost unmatched special sweeper, hitting harder with Psystrike or Ice Beam than virtually anything else in the game