"As this card is now I only see it clog both players hand with useless cards, and give your enemy stock for it."
"It's powerfull against Undead deck but I wouldn't say that I would use it"
Even then, its not powerfull,b ecause after the second play, the retribution cards will be more a pain than the purified ashes. Because of this i changed it with Benediction again
You could write it as "Replace up to 3 random Holy non-Retribution cards in your hand with Retribution. Replace 3 random non-Holy hands in enemy's hand with Purified Ashes. Opponent's stock +# of Purified Ashes in hand"
Nice idea qith the stockgain, depending on the number of the purified ashes, i will add this