Switch Race and Class during combat?

[Henrique]

Originally Posted by Andrew Hackard

I hear this a lot. If it DID make it into print, that is an error. Class and Race cards (and other, similar cards such as Factions from Munchkin Pathfinder) may be played at any time on your turn, including during combat.

Whenever a class or race is changed, should the initial class always be discarded or is there a way for it to return to the hand?