because yu-gi-oh 5D there are some new changes to yu-gi-oh tcg . these changes are effective on Monday, August 11, 2008. first there is now a limited on the deck size 40-60 cards. the fusion deck is now called the extra deck. it holds both fusion and the new synchro monster cards(from 5D). the extra deck must between 0 and 15 cards. Your Side Deck can be between 0 and 15 cards. It no longer has to be exactly one or the other. Multi-Trigger effect monster effects are now called quick effects. for more info visit tcgplayer.com