I'd probally say the chips, the link-navi thing, and the beast/beast-cross... the chips are cool and new, link-navi thing is cool cause you don't need to sacrifice chips, and the beast/beast-cross has wicked effects (and they look sweet in beast/cross), i usually use charge or erase soul, charge cause you get a added chip on the bottom every turn, and erase it shoots all the way, it lasts a long time, even when a navi (Ex. ProtoMan) is flashing from a high damage attack it still hurts them, it's really cool, this GAME is cool!