Don't fall into the trap of calling counterfeit cards proxies because it helps normalize their use in the community and reinforces their acceptability, which is a bad thing for the game, its players, local game stores, and Wizards
However, Blastoise's real potential lies in its Pokmon Power, Rain Dance
With help from cards like Expert Belt, a specific Stadium, and one or two benched Pokmon, it is easy to get combos going where you have added up to 40-70 additional HP and are hitting for 30-50 more damage per turn
PSA 10 versions now command around $300
This can turn a board wipe into a lethal commander damage Voja on the very next turn
For instance, Force of Despair is a good way to deal with Emrakul, the World Anew, which has protection from all spells, and it can deal with other combo decks, like Living End, that play multiple creatures in one decisive turn