Although you can include any number of any type of card - Pokmon, trainer and energy - in your deck other than the rule above, its often recommended that beginners aim to have an even split of Pokmon cards, energy cards and trainer cards: 20 of each
The main principle of the game is card placement
Tyrogue used to be a staple tech choice in Pokemon decks to counter Cleffa but with the release of Catcher, there is a strong notion that Tyrogue won't see any play as most people will opt to run zero to two Cleffa as opposed to two to four before Catcher was released
Rad counters mill players slowly and drain their life totals, and feel like the perfect complement to a +1/+1 counter strategy, since youll be pressuring life totals and proliferating everything in sight
It's much better than the Aid, but it's harder to cast in three or four-color decks and easier in some ways and playable in things like Azorius and Boros
The combination of gorgeous Disney art, honing my technique, and wanting to play as many of the cards as possible keeps me coming back again and again