Yes, I had the same thing happen to me. The text reads "until the end of the turn" -- I think it's a bug.

I'm trying to have some fun, bro. And my fun is Meltdown games.

The iPhone app works the smart way -- it doesn't charge for a Meltdown until you have a challenger, so it's not like the code would...

I really like the Meltdown challenges. What I don't like, is going and creating a deck, hanging out for 10 or 20 minutes, and then -- when no challenger can be found -- being charged 200 gold...