You do have to pay life points to activate its effect though, so be careful if you don't have much time left on your round
There are 2 main issues with letting this card and Thousand-Eyes Restrict in 3 copies per deck: firstly, it reduces the deck diversity, as these are 5~6 deck slots taken since playing these two cards is absolutely mandatory
While this Prince John is better than that Donald (at least he has 1 Strength to start with), he's still not going to make the cut for competitive decks
it becomes able to make a second attack during each Battle Phase this turn, then, if you activated this card by targeting a Synchro Monster with Warrior, Synchron, and/or Stardust in its original name, you can make it gain ATK equal to 1 Synchro Monster in your GY
That covers all the basics about the differences between English and Japanese Pokmon TCG Cards
Firstly, we have the following methods: Booster Packs or Booster boxes, Themed Decks, and buying single cards