A friend and I had some trouble agreeing on Varys' effect. Here's the scenario:

Both of us already had Allies in play when my friend played Varys, and he chose to discard one of my Allies. My question is this: If both of us have Allies in play when Varys is played, does the player who plays Varys discard one of his own Allies, or is he free to choose any Ally in play?

Free to choose. Unless the card specifically restricts who you can choose, there is no restriction.