These cards still play the same way as their regular card versions, and have no advantages in battles
You should absolutely be playing more expensive rocks, because they give you a big boost in mana
But for those looking for condensed advice: the ingredients of truly fierce competitive decks are infinite combo pieces, tutors to find them quickly, resource acceleration (mana rocks) to cast all those cards faster, and cheap interaction to stop opposing combos developing
So, if you type the name of one of these into Google and when you get to the place it tells you, the TCG shop is nowhere to be found, try looking up
For example, the resurgence of interest in Pokmon during its 25th anniversary in 2021 led to a dramatic spike in card prices, fueled by nostalgia and increased media attention