The game log and maybe even the main player area really need to let the player know that the opponent's Enchantress nerfed their first action.
I'm curious how many erroneous bugs have been reported because of Enchantress...
I suspect that you're right...undoubtedly one of the things that's at/near the top of their "to do" list.
In the meantime, you could try to use brepperts tool: http://forum.dominionstrategy.com/index.php?topic=16837.0
Note: Only works for Chrome, per the creator of the fix.