I'll start out with a few players who have played for the O's at some point.
Headlined by current/former Oriole Brian Roberts.
Chris Hoiles was in camp as a special catching instructor and he signed a number of cards for me.
My goal is to eventually have a signed Orioles baseball card of every modern era player to have played in a game for my favorite team. When they do not have a card in an O's uniform or any card at all, I will try to get any autograph available. The project is huge and might be impossible to complete, but hey, it sounds like fun to me!