ExileTopXMayPlayUntilEndOfTurnEffect UI improvements

Noticed a UI/usability issues when playing with a deck with many cards which let you exile and play the card on a later turn. E.g. [[Prosper, Tome Bound]], [[Outpost Siege]], etc.

The exile window that gets opened shows ALL cards exile by that source, even if they are no longer playable. It is difficult for your opponents to keep track of which cards you can still play since they don't get a visual cue. This is especially bad in a multiplayer commander game.

Proposed solution: After the card is no longer playable, it be moved out of that exile zone and into general exile. Thoughts?