Each Disney Lorcana TCG starter deck includes everything a player needs to start playing against another player who has their own deck
Most of all, Im surprised Pokemon Pocket let this happen
There are interesting interactions possible with it, and I think monstrous is likely a mechanic well never see again, as it almost does an Alchemy move on the card, altering it without any sign, like flipping it over or adding a counter
Counter Blitz Infinite Maybe it was intentional, maybe it wasn't, but putting Walking Ballista in a Commander precon focused on counter generation is always a risky move
The timing is a little weird since decks that want Purphoros effect also want him to be the top end of their curve or at most for there to be a few five-drops, which leads to some awkward choices, but given what your game plan is likely to be you will be reasonably happy to be casting smaller creatures as long as they keep hitting your opponent and can be pumped at will