Hearthpwn

Triggers twice means that:
Si7 deals 4 damage (2 damage twice)
Cold Blood adds +8 attack (+4 twice)
Eviscerate deals 8 (4 damage twice)

Turn 10 OTK with Leeroy (no Emperor needed):
Killing Spree (1 mana)
Leeroy (5 mana) - 6 damage
Cold Blood x2 (2 mana) - 16 damage
Eviscerate (2 mana) - 8 damage
Total 30 damage

Turn 10 OTK with Southsea Deckhand (no Emperor needed):
Equip dagger (2 mana)
Southsea deckhand (1 mana) - 2 damage
Killing Spree (1 mana)
Cold Blood x2 (2 mana) - 16 damage
Eviscerate x2 (4 mana) - 16 damage
Total 34 damage, +1 from dagger hit

Assuming weapon is already equipped, sub Shadow Strike for Eviscerate for turn 9 OTK, or sub it for
Cold Blood for turn 10 OTK:
Shadow Strike (3 mana) - 5 damage
Killing Spree (1 mana)
Southsea Deack hand (1 mana) - 2 damage
cold Blood x2 (2 mana) - 16 damage
Eviscerate (2 mana) - 8 damage
Total 31 damage on turn 9. You can do the same combo with but 2 evis and 1 cold blood on turn 10.

Emperor adds many new permutations.

Emperor and Malygos OTK on turn 10 (discounted cards marked with *):
Killing Spree* (0 mana)
Malygos* (8 mana)
Eviscerate* x2 (2 mana, 36 damage) - normal evis does 4, with Maly it does 9, with Killing spree
each eviscerate triggers twice dealing 18.
Total 36 damage

Emperor and SI-7 (discounted cards marked with *):
shadow Strike (3 mana) - 5 damage
Killing spree* (0 mana)
Si-7* x2 (4 mana) - 8 damage
Eviscerate* x2 (2 mana) - 16 damage
Hit face for 1 dmg with dagger (assumes weapon already equipped)
Total 30 damage on turn 9. The same combo can be played on turn 10 with one less discount.

Emperor also enables faceless combos (discounted cards marked with *):
Killing spree* (0 mana)
Leeroy* (4 mana) - 6 damage
Cold Blood x2 (2 mana) - 16 damage
Faceless Manipulator* (4 mana) - copy 22 damage Leeroy
Total 44 damage on Turn 10

The same can be done with 1 cold blood and 1 evis (discounted cards marked with *):
Killing Spree* (0 mana)
Leeroy* (4 mana) - 6 damage
Cold Blood (1 mana) - 8 damage
Faceless Manipulator* (4 mana) - copy 14 damage Leerogy
Eviscerate* (1 mana) - 8 damage

Total 36 damage on Turn 10

Southsea deckhand saves 4 mana over Leeroy, making Faceless combos possible without Emperor:
Southsea deckhand (1 mana) - 2 damage (assumes weapon already equipped)
Killing spree (1 mana)
Cold Blood x2 (2 mana) - 16 damage
Faceless (5 mana) - copy 18 damage deckhand
Total 36 damage on turn 9, +1 face hit with dagger

And so on. This card is OP and I don't think it will ever be printed. Though it might hit a sweet spot If it added a flat +2 damage on combo spells, instead of doubling it (+4). If that happened, we could see something like this in the game.

Combo: Holy Harbinger + Holy Harbinger + Kobold Geomancer x 2 + Bloodmage Thalnos + Mindblast = 32 damage. I'm sure there are other ways of doing this, but this was the only one that I could think of that only requires one spell. Emperor Thaurissan needs to hit 4 of the 6 combo cards in order to lower the cost of the combo to 10.

I designed this card more to be a cool priest card than to make it into an OTK card. Prophet Velen's effect is so cool, so why not put into a smaller card with more limited, but more flexible, power? Remember, it only applies to the NEXT spell or hero power played, so you can't double mind blast or double flash heal. Also, it only applies to THIS turn, meaning that you can't set up a guaranteed two-turn lethal. It's a 3/4 minion because it can be good in the late game when combined with powerful spells, and it can be good in the early game to curve out with a nice 3/4 body if you really need it.

I didn't want to make it 2 mana because it would make the combo too easy to pull off, and I didn't want to make it 4 mana because it would make the combo too hard to pull off, and priest already has decent 4 drops.

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A lot of people are making cards that are blatantly OP and wouldn't fit into Hearthstone without creating balance issues. Well, not this card.

This card is a strictly worse version of Fireball if its secondary effect is not utilised. It is a card that could create a deck that revolves around its OTK.

One OTK I thought of is: Emperor Thaurissan to reduce the cost of: 2x Evolved Kobold and this card. That combo would deal exactly 30 Damage with exactly 10 Mana. 

Overall, the card isn't too broken on its own, and makes a fun OTK without having like 7 combo pieces being reduced by Thaurissan (very unlikely in an actual game). At the same time, it is a strictly worse version of a Mage card unless it is combo-ed.

EDIT: Changed Twisted Kobold to Evolved Kobold. Fixed a typo.

Undercosted 7/7 with a downside - you grant your opponent a Legendary battlecry and deathrattle from your deck, plus you remove that Legendary from your use. Best played in tempo Rogue with possibly Edward Van Cleef and no other legendaries. 

OTK: Summon Majordomo Executus from your deck for your opponent (you may play it and Gang Up if you draw it first), destroy it, turning your opponent into Ragnaros, then use Eviscerate twice. No Emp Thau necessary.

Assuming Emperor Thaurissan ticks once onto all combo pieces, as Warrior, you can play this with 2 Southsea Captains, then equip a Fiery War Axe and play 2 Bloodsail Raiders (both will now be at 5 damage). After that, a Southsea Deckhand or an inner rage will put you at a minimum of 30 damage.

You can also achieve on OTK in rogue with One-eyed Cheats instead of Bloodsail Raiders, and an Eviscerate plus Southsea Deckhands or Sinister Strikes.

This is a 5-card OTK combo that relies on 2/5 cards getting 1 proc from Emperor Thaurissan.

The combo is Embrace the Shadow -> Exodar Achorite x2 -> Flash Heal x2 -> Lesser Heal = 11+11+8 = 30 damage!

Achorite is an honorific title given to Draenei priests. The card's effect is a weaker version (both effect and duration) of Prophet Velen, the leader of The Exodar. The card's main purpose is to be played along with several heals (and/or Hero Power) to get more value out of them.

My entry for the week. I wanted to try and make a card that would be useable outside of a OTK deck, as well as giving the possibility for the combo. The basic combo is this: Lightning Bolt x 2 for 6 damage (24 remaining) then Cracklefor 6 damage (minimum) 18 remaining, then 2 x Lava Burst for 10 damage (8 remaining) then finishing off with Feedback for 10. There are a few variants on this as well, but the example above needs 4 cards to get an Emp discount. (2+4+6+2=14)

Outside of a OTK deck, it could be used as exceptionally good value removal, or a bit hit for face following something like Earth Elemental or Elemental Destruction

Unicorn Priest is REAL!!!

Combo Example:

Turn 0: Emperor Thaurissan
Turn 1: Unicorn, Kobold Geomancer, Bloodmage Thalnos, Mind Blast, Mind Blast, Holy Smite, Holy Smite, Attack with Unicorn.

Mana Cost:
Unicorn - 5 Mana (-1 Emperor) = 4 Mana
Kobold Geomancer - 2 Mana (-1 Emperor) = 1 Mana
Bloodmage Thalnos - 2 Mana (-1 Emperor) = 1 Mana
Mind Blast - 2 Mana (-1 Emperor) = 1 Mana
Mind Blast - 2 Mana (-1 Emperor) = 1 Mana
Holy Smite - 1 Mana (-1 Emperor) = 0 Mana
Holy Smite - 1 Mana (-1 Emperor) = 0 Mana

Total: 8 Mana

Damage:
Mind Blast - 5 Dmg (+2 SP) = 7 Dmg
Mind Blast - 5 Dmg (+2 SP) = 7 Dmg
Holy Smite - 2 Dmg (+2 SP) = 4 Dmg
Holy Smite - 2 Dmg (+2 SP) = 4 Dmg
Unicorn - 1 Dmg (+ 2Dmg x 4) = 9 Dmg

Total: 31 Dmg