So I would not use this card in a deck on its own, if you choose to, don't use more than 1, try to use this card early in the game and use Mind Bend
Build a budget version first, substituting expensive cards with functional alternatives
Its 190 HP value makes it hard for many decks to knock it out, and when the attack is paired with cards like Potion (which heals 20 damage) and Erika (which heals 50 damage from a single Grass-type Pokmon), it can be difficult to deal with
So it would keep that +x forever, and gain even more whenever it challenges again
Sometimes, the card is so overpowered that it's questionable whether or not they should have been created in the first place, the likes of Spellbook of Judgement being one such card
Or you can crack your own slab and reuse that for future reference