How many of each card can you have in a deck?
I've been casually collecting for some time, but have never actually gotten a competitive deck together. With that said, I got a lot of cards and I'm thinking of downsizing my collection, since a lot of it is a bunch of random basic cards. But I still don't have a deck planned out or any plans for one yet. Bottom line, got lots of cards, thinking of getting rid of a few.
Is there any reason to keep more than 4 of one card? (with the exception of energy cards of course) I notice in the starter decks they have usually 4 copies of several different basic cards. I want to keep my options open for future decks, but I don't want to be holding on to every card for no reason. So, how many of a single card can you have in a deck? (besides energy cards) And is there any reason to have more than 1 or 4 of any card?