yu-gi-oh cards

i used to love em and my friends and me would duel for hours. then one of my friends became a complete ass hole, and the other stole my moms card that was selling for $30 on eBay and he sold it at our local card shop for five bucks. and i lost two friends. and sold every card i owned for $70. and it has been three years since i have played. and am getting in to it again. so what did i miss? any new rules( i still remember all of the old ones) and one of friends told me that there is a new type of monster called syncrose or some thing? and what other new decks did i miss? FYI i dont watch the show. in my opinion it sucks, the game is as far as i go. and every one in my family played but my dad. and yes my mom too she is the one that taught me how to play. and my brothers. 
