It would be nice to have all versions because for single enemies that summon monsters, it would work good. There may be tag team duels that might require more enemy decks. Or if it is a collaberation/collective style duel, it would be nice to share just one deck for that enemy troop. Could these 3 versions be applied to player decks too? It would be an interest battle to have the party leader with the only deck, each player with their own deck (already implelemented) and a collective shared deck by the party. It would be nice to have different kinds of card combat scenarios to spice battles up.