I've never really understood why Emerald Megalith was considered one of the harder Patchy cards. It seems a lot easier than, say, anything with the fire bullets, or Sylphae Horn/High Level, Green Storm, or, err, actually, most of her cards. :V I haven't reached Patchy at max rank many times (if ever, I can't really remember), but unless it completely ramps up in difficulty by a ridiculous amount I don't really understand why it's thought of as very difficult.