IIRC in Yugioh there is only a certain number of Blue-Eyes (from the show?), so you could put a rule on the card 'there may only be X Blue-Eyes on the battlefield at any time', Star Wars CCG used to have permanents that you could have 2 or 3 copies of in play, in addition to stuff you could only have 1 of, the concept would work fine here too, only this could care about both players' boards
Release Format: Booster Box
Credits, earned through achieving milestones or transferring cards, can be redeemed for single cards
And sure, earning more gems is better and makes drafts overall cheaper
Pull rates for VS Pokmon cards are relatively low, as holo rares were much harder to obtain compared to modern sets
It's also a lot faster to evolve Arcanine EX and put it into play a lot sooner than Charizard