This gives you time to summon some powerful cards from your deck
Mega Pinsir, for example, can be played directly as a Basic Pokmon card, and Mega Blaziken is evolved atop a Combusken
Obzedat is a lot better, and it isnt close at all
Then you can place that casted thing on the bottom of your library to draw again next turn
Its already decent as a two-mana, two-power unblockable creature, but in a format overloaded with cheap noncreature spells (and this includes Modern) its just about casting Ponder and Bolt, its about using Mishras Bauble and other such broken cards to set up a copied huge spell, and Im here for that
As far as their aesthetic, Prism Star cards had black borders, a silver border under the Pokmon's illustration box, and a huge, holographic Prism Star symbol on the text box