So not sure as cast as required means. Card reads, "Cast as required. You may evade any creature or character until the end of the turn."

So does it have to be played as in "You draw a dragon, you cast before combat to evade."

Or "You draw a dragon, choose to fight it. Roll dice and lose, then cast to evade it."

The later is never an option, check the rules on combat sequence. Evading is something you do before starting the fight (if you have that ability to evade.. or cast a spell so you temporarily have the ability)

K thanks I didn't think so but my friend tried to argue it wasn't required until he lost. When I said at that point the battle is over and he couldn't evade what was already done.