I think there could be some improvements around this, perhaps you folks can help me think through the issues.
The problem is, you pay the 1 hero coin to show the three choices, but you dont get a card until you show select one, and there are a lot of things that can happen between revealing a card and selecting one. You might lose your internet connection, your browser might crash, you might just forget, or like above, you might choose to think about it some more.
What I decided was that, your three choices are global to your account, and the game won't ever let you draft more cards until you have decided which of the three you want. If you decide from in a game, you get the choice in your hand as well. If you choose from the collection screen in your menu, the card is simply placed in your menu.