The difference between having something in your hand and nothing is a huge improvement for gameplay, both because it allows hidden information and creates more dynamic gameplay situations
Banlist History Restriction changes recorded for Mystic Mine
Once per turn: You can detach 1 Xyz Material from this card, destroy 1 card on the field, and if you do, you can banish 1 card in your opponent's hand
The set has good pull rates and opening a full booster box will net you a better than average pull rate when you consider the Trainer Gallery cards
It also comes with a 2-card Collector Booster Sample Pack (contains 2 alt-border cards of rarity Rare or higher), 10 double-sided token cards, 1 deck box (can hold 100 sleeved cards), 1 strategy insert, and 1 reference card
Since he is main character I always assumed the show and the TCG were perhaps rather separate business entities, more than we would imagine