Yes, your opponent is able to kill your creature to start untapping their own again, but they're going to have to do so at a costly rate
Basically, the deck feels unbalanced, and if players know your strategy is basically to go all in on creatures, they're going to be far more aware of your combos and keen to stop them
Its dual typing renders it immune to Electric-type moves, offering strategic advantages in battles
Thankfully, the card itself is well worth playing in a Goblins deck either way
but if you plan on the copies sticking around, you need something that makes them nonlegendary
As resellers capitalize on the scarcity of rare Pokemon cards, questions about the inclusivity of the TCG hobby become apparent