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they need to be cbp by a good card so Moses can use them.
Plague of Flies is too powerful. Making a battle FbtN only for Evil as well as Negating Curses and Evil Forts, plus a hand discard that can easily be large, playable pre-battle is too grand.
Plague of Boils would be crazy powerful even if it weren't TC, and as TC it's going to shred any non-meta defense. Just lower the decrease for an Exodus Hero to 3/3 and remove the TC.
Plague of Locusts would be one of if not the most powerful cards in the game.
Plague of Darkness would be overbalanced if it weren't TC, but is way too powerful as TC. All my speed works but yours doesn't? Yeesh!