What's most important is that fixed damage cards are basically useless against Valeria since their unmodifiable damage is basically too low to be of any use against her huge healing. What you ultimately need are cards that have their damage grow based on a certain condition and then setting things up for the condition to ultimately have the damage grow to absurdity. Unfortunately Ultimate Dark Fairy Queen and A.E.R.A. aren't allowed the damage Valeria so those 2 easy wins won't work.