Starmie EX is very straightforward but powerful: with only two Water Energy you can deal 90 damage, two-shotting most opposing EX Pokemon while taking out most Basic Pokemon in a single hit
Weve reached a metagame where coinflipping into either a brick or a board lock is worthwhile, and its hard to see Dogmatika being a top player there, but with an upcoming banlist, and more cards on the way, perhaps theres room to bin a whole Extra Deck
While Joey may not have had access to these powerful extra deck monsters at the time, Im sure if he did, he would have won a lot more duels with this guy in his deck
Once everything is prepared and done, start doing damage to your opponent but be watchful of your Pokemons HP
Putting the creature on top of your library isnt much of a downside since you can just play this at the end of the turn before yours or even in your upkeep to draw the card straight away