Hearthpwn

This spell is used to buff Zerek,Master Cloner. You can have 4 Masters eventually. :)

not too many minions are good as a 5 mana 5/5 and more importantly you need that minion to be on the board.

the epic everybody hates to pull. DUST ! 

Dust it! Dust it with fire!

Damn is this card good... Imagine playing this on a Carnivorous Cube and then destroy it yourself with Shadow Word: Death ... This is so much value! Dark Pact Who? Am I right?

Power Word: Replicate

5 Mana to summon a 5/5 if you have a minion on board, so value generation if you also want a decently sized minion.

Harder to pull off then Shadow Essence since you need a board, so not exactly something you expect to play on curve;
but you can choose what you get.
It's basically a worse Faceless Manipulator as a spell, good for Big Priest since it's not a minion.

Priest already can create copies of minions. Decks can run Vivid Nightmare , Mirage Caller , Lesser Diamond Spellstone , Shadow Essence , Eternal Servitude ; the list goes on in wild.

This seems like it is a packfiller version of a spell - nothing new, just flavor for the "cloning lab" theme.

If you want to make an OTK with this card, just use Vivid Nightmare. This card, seems, for the tempo decks because in tempo decks you care about stats.

They seem to want make summon 5/5 priest a thing with all possible ways.

Similar to Faceless Manipulator, but gets discounts from Radiant Elemental and can be discovered by Shadow Visions if any of those would matter for some combo-wombo

Extra hype for Zerek, Master Cloner! T10 play summons 15/15 value

*edit* yeah maybe more like if it survives the board 

Only if you have either The Coin or Radiant Elemental or such. thats a 11 mana combo

you lack imagination if you only think that way. There's plenty of combo potiential here

idk with plenty of combos. if this card is good, why not play faceless manipulator in the first place  ? Copying your own lich king only 5/5 and this spell cant target enemy tiron or something @_@

Well, You can discount this with Radiant Elemental, copy it with Shadow Visions, trigger abilities related to spells like Lyra or Master Cloner, copy weaker statted minion with powerful ability (like 1/1's summoned with Twilight's Call or Zerek's Cloning Gallery), and of course, play it WITH faceless manipulator and dual copy enemy Tirion.

There could be more people might come up with, but these are just what I could thought of right now.

There is potential for it, but it seems obvious that with this theme that Blizz is doing with priest. They want them to play more tempo/deathrattle without question.

Yeah, Blizzard really pushed Togwaggle Druid, they made so much cards specially for it!