Hearthpwn

The way this works is that you need to play your Prophet Velen (or get it through Shadow Essence), and let it die (if it doesn't die you could maybe pull your combo earlier). Once it has died, you will need either one Eternal Servitude and one Vivid Nightmore, or two Eternal Servitudes.

You need to keep your Radiant Elemental in hand all game, since you will need it for your combo. You will also need your Mind Blasts for it, and the more you get of those the more damage you will deal. You can also choose to keep your Holy Smites for more damage, but they aren't required.

To pull off the combo, you first play your Radiant Elemental. Then you use your Eternal Servitude to resurrect Prophet Velen. Now you either use your second Eternal Servitude to summon another copy of him, or use Vidid Nightmare to get a 1 health Prophet Velen. Your Mind Blasts will deal 20 damage each now and will cost 1 mana, and your Holy Smites will deal 8 damage and cost no mana. The more you have of either of those, the more damage you can do.

The normal combo, which consists of doing 40 face damage, costs 9 or 10 mana, depending on whether you use Vivid Nightmare or a second Eternal Servitude, but from experience I discovered that often you will be able to deal more damage than that.

You can use your Shadow Visions to generate more Mind Blasts if you see fit to do so, but you can of course also use them to get more board clears, since you need those to survive against most decks.

Bloodmage Thalnos is in the deck for 2 reasons. One of them being that Explosive Runes is played right now, and he could be used to bait that out. The other reason is that he makes Spirit Lash an awesome card for both clearing and healing your hero back up against aggresive decks like Aggro Paladin.

Shadow Reaper Anduin is only really in the deck to clear big minions should they appear, or to give your hero that 5 armor, which could really save you in some situations. Otherwise I wouldn't recommend playing him, since in this deck the healing from your hero power is more important than the extra damage the DK card gives you (though obviously that could be different while playing against different decks).

It is very important for this deck that you try to get a lot of value out of your removals, so that you clear as much as possible. For example, don't use your Shadow Word: Pain on like a normal 2-2, unless it is really threatening you. Try to remove as much damage as possible with it, so preferably only minions with 3 attack.

The same counts for your Psychic Screams. It is the best board clear this deck has, so only use them when there are indeed a lot of minions on the board. Holy Nova is a less important card, and so is Holy Fire. Play these cards when your hand is full to make more space.

Mass Dispel is only really in the deck because there weren't really any other cards that could fit into the deck. There were no good spells left, en you shouldn't put any more minions into this deck, since it would pollute your Eternal Servitude when they die, meaning that there will be a chance that you can't resurrect your Prophet Velen. Still, since there wouldn't be any silences in the deck otherwise, Mass Dispel still works for silencing buffed minions, and since it draws you a card you can always just play it at random to get another draw.

Feel free to experiment with this deck and give it your own twist. I'd love to see what you all think about this deck. I've had a blast playing this, and I hope you all will as well.