Similar to Item Cards, you can play as many as you want during your turn, but you can only attach these to Pokemon who do not already have a Tool equipped to them
Having 40 cards in your main deck is also very effective in most kinds of duels, although adding a handful of other cards is also a good step
Once I added a color to this deck, I couldn't support basic lands, and I converted the s into s to support the color requirements, as well as play nicely with DRC's surveil and delirium abilities
And of course, Gold Star Vaporeon, featuring shiny Vaporeon, is one of the most coveted cards in it
Trample, vigilance, haste, and especially flying are some of the first wrinkles that players see added to creatures
The difference though has to do with the focus