If I were to upgrade these decks with pulls from booster packs, then I would shave some of these weaker cards, especially ones that cannot be turned into ink, and add more five-drops, six-drops and seven-drops
Collector Boosters showcase textured foils and Special Guests , and they are the packs I would choose if I wanted premium variants
Morph, Space Goo Emerald is already considered one of the best colours to play if you like using Lorcanas Floodborn Shift mechanic, which is the ability to play character cards for cheaper by putting them on top of a character with the same name that you already have in play
I dont generally love it when a Cube features cards that are dramatically less powerful versions of other cards in the Cube, but this is somewhat unavoidable in Vintage Cube, and Magus of the Order is a significant upgrade over several of the green fours currently featured
Some locations also have their own lore value, again just like a character