Hearthpwn

Wild combo:
Cards required: Zombie Chow / Embrace the Shadow or Auchenai Phantasm / Grave Rune / Spiritsinger Umbra / Deliverance / Emperor Thaurissan 

Obviously reduce your 5 card combo with Emperor Thaurissan .

Play Spiritsinger Umbra for 3 mana
Play Auchenai Phantasm for 1 mana
Play Zombie Chow for free and deal 5 dmg
Play Grave Rune for 3 mana on the Zombie Chow
Play Deliverance for 2 mana on the Zombie Chow dealing 5 dmg and summoning 3 new ones dealing 15 dmg.

9 mana / 5 cards / 25 dmg
You could use Circle of Healing to kill three more Zombie Chows for a 40 dmg combo.

Won't win you many games, but might be a fun combo to try out. :)

Can actually be used on your own Devilsaur Egg and such in a wild tempo deathrattle priest if you are facing a control/combo deck that isn't playing many minions.

I mean, Serpentshrine Portal is a Shaman staple, and this is, in some ways, kind of equivalent.  Remains to be seen how consistently Honorable Kill can be triggered.  If everyone is running 2/3s and 4/3s, this will be nuts.  If folks are running 3/2s and 3/4s, this could easily be garbage.

That said, this is an interesting combo piece.  Cast on your own Radiant Elemental after Grave Rune, and then go to town.

I can hear the banjos play as he fries.

Deathrattle Priest vs. Deathrattle Rogue battles are going to be epic.

This is actually pretty damn good. 

Not a res priest card for a change!

Imo , this card isnt just  a " penance is better " and we end here . We all know how easily priest manipulates the board , and this is a really good tool to steal minions for your raise dead pool and nice tempo card to take some small lead early by flipping things . Dont know how , but if you manage to have spell dmaage on board , then it gets more interesting . Definately it will not see plays using on deck , but from discover it will be a decesnt option for sure in many cases , even blindpicking it , dont know . 

Quote from Thanatos2k >>

Eh.  Penance is better.

 Dude. This is vastly superior. I already have a headache thinking about the crap this will pull off in Arena and likely Standard/Wild.