Well, the initial release won't have any cards with counter skills, but for future reference, how do they work?
an example of a card with a counter skill (from the Japanese version, obviously): http://login.alteil.jp/cardDB/detail.php?id=155. The grey skill is the counter skill. Running the text through babelfish, you get "By your [maximum HP+: 5/HP+: 5/DF+: 5] It does," which sounds like it gains 5 hit points, 5 max hit points, and 5 defense whenever the counter skill triggers.
