Well, right now the wording of the card implies that it will only alter the atk/hp of the creature, but upon testing, Archangel works extremely well with Rage Potion/Elixer, as the Angel can heal back the lost health. I'm not sure this is intended, but it sure is nifty! Also, it's a good cheap boost to some control decks using flying weapons, as once you have lockdown you can Elixer your flying Eternity and swing for 10 (just a thought to put in that Flames of Eternity deck of yours, SG).