Based on the rewording, this is how I would interpret YOU ARE DOOMED to work:
    1. Grievous plays YAD, chooses Obi-Wan, who is adjacent to a magnaguard.
    2. Obi-Wan's player must discard 2 cards. (Clone Troopers don't factor in, because they weren't chosen.)

    -OR-

    1. Griveous plays YAD and chooses a CT adjacent to him.
    2. Obi-Wan's player must discard 4 cards, because there are two of the chosen character in play.

That right?

The Sultan

You're only young once, but you can be immature forever.
Dorkistan