Hearthpwn

I pulled both Fiery bats and added a pair of Sunfury Defenders, and it still took a few tries. But it did the job!

I didn't have an extra enter the coliseum, so I dropped Uther into the deck. Turns out that was my win condition, because Kel Thuzad didn't show up until the very end. Got three horsemen out, dropped both Target Dummies and next turn called the last Horseman for the win! Lich King never made it out of phase two! But the basic design of your deck is still good, I recommend dropping Uther in though.

Brutal deck! I run the variant that takes out the rhinos and puts the Stampede in. Stampede, and both Jeweled Macaws and I was sitting on a big handful of critters at turn 5! Ate a quest rogue up pretty badly too.

Definitely not as bloated with unusable cards as Dog's deck.  More streamlined.

Dear God this deck is nasty! I bounced a swashburglar back and forth in my hands all 4 times within two turns! By turn 5 the caverns was in play and I already had minions on the board. Opponent conceded 1 round later!

Awesome deck! Went pretty much undefeated except in one game where I kept drawing high cost mana cards against a face hunter. By the time I got something on the board it was just too late. But otherwise had some excellent matches with this thing. Its nasty!

Okay, part of what hurts this deck is reliance on Ysera. I know she's your main play, but she's expensive and any decent player is going to knock her off the board as fast as possible before you get anything useful from her. Surviving into late game to draw her is rough as well.

I'd say reduce the cards to 1x each, drop in Reno Jackson. Why? Because Reno is pretty much your last hope of survival. If the card draws are bad early on, you need to have Reno there or you will die before reaching  the late game to pull Ysera.

This leaves you 10 cards to add things that might work better.

Start with Azure Drake simply because he has a solid body, a card pull, and a +1 on spell damage, which isn't all too useful to a priest until you add things like Holy Smite and Holy Fire. So add those in as well.

Since its a 1 of each deck drop in Raza the Chained, because free healing NEVER hurts.

Drop a Shadowfiend in there. Opponents hate cards that make cards cheaper. They will definitely waste a spell or minion to kill it, and its decent minion for its points. Combined with your other card drawing minions, its a strong synergy.

Since Ysera is so important to your deck, put in Resurrect. It might just bring her back if you lose her (and you probably will).

You have 9 spells so far. Capitalize on that by putting in an Arcane Anomaly. If you can get him out early and start casting, you can have a HELL of a sticky minion that you can later inner fire.

Put in an Acolyte of Pain. He's good for card draw and being a priest you might be able to keep him alive long enough for him to be very useful.

A Gadgetzan Auctioneer does well in this deck for the same reason the Arcane Anomaly does. You have a lot of spells, and he's useful there because he will get you more card draws if correctly played.

Add a Mass Dispel. This will get you a card, and its a spell. Plus, with the amount of buffing Paladin and taunt Warriors out there, this will really piss them off and might save your game.

One card left to add. This deck is seriously hurting for 1 drops. Put in a Lightwarden. With all the healing you have available just from being a priest, she might just come in useful, and again opponents will fall all over themselves trying to kill her off before she gets too big.

This is just my suggestion to make the deck more competitive. I won't lie and say you'll be legend easily with it. And sorry if it ruins your Ysera idea. But with this build you have a much better chance to survive to see her played, and hopefully smoke out most of your opponents instant kills.

I'll have to play it more to give you an idea of what it needs. So far every card in the deck is useful to some degree, and that's what makes it difficult to prune cards from it, without ruining the idea behind the deck. That's half the problem I have with building decks that are made to be fun. Everyone runs the hardcore meta decks even in casual. Its to where you can't have fun "I'm just screwing around with an idea" decks. You have to be geared to beating what everyone else runs consistently.

Whoa this deck is brutal!

I didnt have the extra Small-Time Buccaneer, Patches the Pirate or Shaku, the Collector so I had to sub in with an extra Swashburglar, Bloodsail Raider, and Undercity Huckster. Seemed to work pretty well.

Yogg is in the deck purely because the amount of spells used in the deck make Yogg an excellent late game drop. But you can replace him with virtually any other card you choose. If you play it and want to experiment with another big drop, go ahead. Or maybe you have another card that would get you some mileage. Just be careful not to drop a duplicate into the deck, or it keeps Reno Jackson from working. The main thing in the deck you can't lose is The Boogeymonster. Without him, it's not a Boogeymonster deck. :)

Stealth doesn't work with Rag