It says that I may play this unit from my discard pile. Am I allowed to have more than one of these on the side in my discard pile?

NerdRulez said:

If more than one of them end up in your discard pile, then you can have more than one in your discard pile… just like any other card that you can have multiple copies of in your deck.

you know there is a forum for rules quetions right?

You also only need to hit submit once. You submitted this thread several times.