Feel like a Noob >.<

Okay, since I never really used side decks, maybe someone can answer this...

I know you can't add or subtract to your main deck, only swap with the side.


BUT........ If I add two cards to my extra deck (from the side), and take out two cards from my main deck, is that legal?

you can switch the equal amount of cards from side deck to extra too but competitive-wise; adding extra deck monsters to side deck for to switch out in a match is never recommended