Hearthpwn

This deck is definitely a long term deck.

That being said it works quite well.

Completing your quest early is good but not crucial. Don't use your Call to Adventure to draw reborn minions unless your'e facing a hard aggro Murloc deck or something. 100% best used once you got your Undatakah's going.

You'll notice there are only 3 Deathrattle minions other than Undatakah's Battlecry.

It's very important to NOT duplicate your deathrattles until AFTER you've played your Undatakah, Obviously all 3 are ideal but main focus is guaranteeing he gains Immortal Prelate. So hypothetically playing Undatakah when you've only played Immortal Prelate is ok. He will gain the others over time.

NOTE: Its best to wait to use Undatakah till you can use your new Hero power to summon a 2/2 copy. Reason is alot of silences out there. Of course they could have 2 but we are gonna hope things aren't that bad for you.

Bonus long term effects such as Argent Protector for divine shield and Sunfury protector for taunt.

There is quite a lot of healing in this deck ,it's meant to survive. So save High Priest Thekal for when you can use it at 30 HP. Shrink Ray and Subdue are your 'emergency' cards.

All that being said your main focus should just be clearing their board till late game.

Substitute for High Priest Thakal could be Desperate Measures.