I've read http://pokegym.net/forums/showthread.php?t=74636 and the orginal thread it references. I still don't understand the ruling Pop. Your ruling focused on the first part of the text "Whenever any player attaches..." indicating that only 1 damage counter is healed per attachment no matter how many Energy Cards are attached. However the Stadium text seems to count number of Energy cards attached not attachment actions. "...attaches an Energy card...." This seems further reinforced since the text begins with the word "Whenever" indicating that number of events isn't really a factor here. Is there some sort of meta-rule that I'm missing here?