I'm with MuzakMaker. It's almost always the case that casting Dark Ghost hurts you more than it helps. You absolutely can not use a character who has the ability to Dark Ghost in autoplay. That will only hurt you.

Even worse is the longstanding bug where you attack someone and they somehow cast Ghost (the gold "buff") on 1 - 4 members of your team. I've lost gauntlet battles by killing a Clairvoyant and having my entire team get a 1 turn gold ghost, then immediately die when the current turn is over.

If I could change one thing about the game ... well, I'd make it easier to move talisman sets around. But if I could change one combat thing about the game, I'd remove ghost and dark ghost entirely.