While you're limited by the mana value, there are tons of options for terrifying, cheap Auras like All That Glitters and Twinblade Blessing
The mana curve refers to the balance that deck builders should aim for between cards of varying mana costscheap cards and expensive cards
While the sunlight passes through the Earths atmosphere, the light gets filtered, scattered, refracted and directed towards the moon
I myself love digitizing, because at any given time I can see what card I own - be that on my computer or on my phone - which helps when going over trade binders, deciding on which cards to keep from a draft, and giving me an overview of which cards I own when working with a digital deckbuilding website
In short, Pikachu EX works best at the start of battle when you and your opponent are setting up, or at the end of battle when your opponents big investment has gone to the discard pile
Other decks, it makes more sense to literally "do nothing" and quietly piece out a winning combo and overrun the boardstate within a single turn