Devolve! Vanish! lolz

When rating Dragonfire Potion you should also consider playing it vs Dragon Decks. While it is one of the strongest AOE cards in the game, in some matchups it could turn out to be almost useless.
If you create a deck which only uses Dragonfire Potion as AOE, you will have a really hard time facing other Dragon Decks.

You won’t only have problems against pure Dragon-Decks, but there are often times you have to use Excavated Evil or Holy Nova against a single Azuredrake, which is found in every deck. Not with Dragonfire Potion anymore. And as a Priest you don’t want to let Azuredrakes to stick on the board.

It feels a bit like the Burgle Decks, which doesn’t work against Rogues, so you can’t rely 100 % on it.

I couldn’t find any card to be replaced by Keeper of Uldaman. The problem with it’s buff / debuff is, that he doesn’t really help you if you have no board and your opponent has a minimum of 3 minions.
Imo it is a wasted card against face