Hearthpwn

Since the nerf, I've been playing a ton of aggro priest. I got completely run over by an aggro priest and was hooked to try to figure out what just happened and how I could do that to my opponents. It's got some really nice advantages since machine gun priest is pretty prominent in the meta right now. Opponents never mulligan correctly for the game.

New tools that are fueling this deck: Cobalt Scalebane, Shadow Ascendant, Acherus Veteran

My current deck:

I took 'spinalogaman' deck as Inspiration for my build:

The decks can consistently wins games on turn 5/6 and can snowball quickly with all the cheap buffs. Probably most surprisingly, it also seems to have a positive win-rate v. pirates and face hunter.

So my question: is it crazy to think a priest aggro build could actually be a Tier 1/2 deck in the coming months?

I think that one of decks strenghts is the element of surprise.

Quote from Pusukala >>

I think that one of decks strenghts is the element of surprise.

Well beating Pirates and Face Hunters with this deck is quite the norm. As both of the decks suffer to the same problem which is that they need board presence, especially Hunters which instantly lose when they lose their board. Priest is very strong at value trading and can slightly outheal out of range for most Aggressive decks. 

max tier 2, because it will never have such a strong appearance as druids or kazakus priest, not good removals etc.

 I am recently playing a Mid-Range Priest build, which I try to make viable (can post the list later) and therefore really appreciate your attempt at building that Aggro Priest as both decks have similarities.

Best tier possible? Tier 2 - could be tier 1-1.5 if you can find the perfect balance in a Inner Fire/Divine Spirit build, which I have not been able to as of now.

However, let's address your current deck and let me give you some thoughts of mine on what to improve:

1. Take Young Priestess out. Every 1-drop that dies to Patches (or to a ping of any kind) is one that is not good enough sadly. Your deck needs to snowball as consistently as possible and a Priestess does not help that cause, as she is not safe to stay on the board for an Ascendant buff for example. Her effect becomes pretty insignificant later on as well. A way better minion for your deck would be Fire Fly. With 2 health, it survives the first turn pretty much always, it gives you another minion to put on the board and therefore an additional target for Cobalt Scalebane and Shadow Ascendant.

2. Shadowform doesn't seem to help you winning in the most cases. It is too slow, as it can't be played on curve in an Aggro deck. That card is a too big hit on tempo and therefore not worth the slow 2-damage burn.

3. Crazed Alchemist kinda made sense in that deck template (even though he didn't have enough good targets for Inner Fire/Divine Spirit), but not so much in your deck. Same applies to Inner Fire. Most buffs in your deck are ones for the attack value and don't really run too many high health + low attack minions where Inner Fire is best played on. You should either cut 1 or even 2 Inner Fires or add more good targets for it, because as it stands now, you are better off running SW: Pain instead of Crazed and Inner Fire. It is a way more consistent card in what it does and has the same effect if not better in your specific deck. Also, removing Doomsayers and Southsea Captain always comes in handy

--> You could also try Shadow Visions for the sole purpose of getting more Mind Blasts, I believe it would do a better job than Shadowform anyway

4. Ooze is unneeded, as there is no class besides Paladin that runs bigger weapons that need to be destroyed, as Pirate Warrior got less viable and played. Also Fallen Sun Cleric is pretty lackluster as well.

General replacements or potential inclusions could be: Fire Fly (you should include that imo), Dirty Rat, Curious Glimmerroot, SW: Pain, Spellbreaker, Bonemare, Tar Creeper or Stonehill Defender (and also a teched Dirty Rat) to get more Inner Fire value if you decide to keep it.