Well I've already got a thread about my suggestion for Holy. Give it 10 tokens, and lower tower even if there aren't any undead, just to give it a tiny bit more vs non-undead.
"That's incredibly overpowered. An uncommon card that can absolutely ruin a holy deck..."
Not at all. It's an uncommon, meaning you won't get it often. After you've discarded, the Holy-deck will bounce back fairly quick, since there are a couple of "Replace a card in your hand with a Holy-card" or Heresy etc. It'll just give you like 5 rounds, before the Holy-deck has put in its first Purified Ashes into your hand, while you're sitting there with your scavengers.
"Discarding -all- of any keyword is really powerful, but to replace it with an almost useless card... that's ridiculous."
Holy does that to Undead non-stop. Undead vs Holy is REALLY hard, and this card is only really useful if playing Undead vs Holy. Only discarding them would mean new Holy-cards. "Replace these cards with non-Holy cards from opponents deck" wouldn't work.
"Also, if you were to change it to replace all Holy with purified ashes, and all Undead with Abyssal Scavenger, then that just doubles it's effectiveness. People without either Holy or Undead in their deck would ALWAYS have this card. It would completely shut down either deck."
Read the card again. It only replaces YOUR Undeads. It'd be useless vs an Undead-deck.
The reason I named it "Normality", is because it brings things back to normal. Nothing Holy, nothing Undead.