Reaction cards seem to be common enough to merit a glossary entry. I think a definition like "A Reaction is a card which is played at an unusual time. Either the card itself or a Special Rule will say exactly when it can be played. When played, has a one-off effect like an Action and is then placed in the discard pile." -Bucky 15:51, 13 July 2010 (UTC)
- I've included this general idea in my Additional Rules - Physical Challenge set of rules, which I've created in hopes that people will adopt some of the terms used. I should note, though, that the popular card game "Dominion" has you keep your Reaction card, which you can later use as an action, so the part about placing it in a discard pile may not be what we want to say.
- -- Wayland 10:29, 14 July 2010 (UTC)