To put it simply, back when the game first released, it was several packs behind the current TCG releases
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The main deck has non-engine cards that are needed to cover the most meta matchups, while the side deck is used to add more coverage for these matches and to have responses to more random rogue decks that players would be likely to see in the early rounds of regional events
His ability to use stun counters on the most important blocker also means he's going to demand a lot of respect on his own, so Blue/Black mid-range strategies may find a lot of use for Kaito
That being said, Im always excited about not having a maximum hand size on Turn 2
Youre also not going to make a lot more money than using one of the other options