Question: Does this effect kill a board of Jades in wild? They have different stats and artworks depending on the progress of the jade deck even if they are all "Jade Golems", so I'm kinda confused about this.

It will destroy all Jade Golems on the board, and ones that happened to be shuffled into your/your opponent's deck or added into your hand/their hand. Don't think it kills the effect of them growing, since the effect grows with each Golem summoned.

Pogo bunny meta destroyer!

Prime Shadowstep target. Finally rogue has a way to fight back against infinite combos. Keep in mind this destroys your own copies of the minion as well.

Quote from Ixlid >>

Unidentified Contract saw no play even with pre-nerf Preparation. Not sure what type of deck will run this card in the future.

 The bonus effect didn't justify the cost.  A 4/4 body that not just kills, but eliminates all copies of what it kills, certainly does.  Flik and Unidentified Contract are apples and oranges; you cannot compare them.

Even ignoring the "all copies" part, it's Assassinate + 4/4 body for 1 additional mana. Also shadowstep-able and otherwise duplicable because it's a minion, not a spell. VERY good.

Flik Skyshiv can stop Shirvallah, the Tiger Holy Wrath and any card that copies of a card and you can even stop Mecha'thun if you play your own and play Flik Skyshiv on it just to stop it or in wild N'Zoth, the Corruptor can be a pain but if you play your N'Zoth, the Corruptor and they don't kill it you can trade up then use Flik Skyshiv on it to make sure they lise there N'Zoth, the Corruptor turn only things i am not sure of is the interactions with cards like Sylvanas Windrunner will it stell take one of there minions if it die's in your hand or deck or if you use Flik Skyshiv on a card like Khartut Defender will you get a heal and 3/1 or will they both die or will you get any heal at all

The Artwork is superb

༼ ºل͜º ༽ºل͜º ༽ºل͜º ༽ ＥＶＥＲＹＯＮＥ，ＧＥＴ OUT OF ＨＥＲＥ ༼ ºل͜º༼ ºل͜º༼ ºل͜º ༽

This will see play no matter what. Even if it only kills a minion, it's a more consistent vilespine slayer. And even when a card doesn't see play for a meta, it doesn't mean it's bad. Boom for example didn't see serious play until rise of shadows, now it's nerfed. Vesinna didn't see play when uldum came out, now it's in a tier 1 deck.  As long as rogue is a playable class in the meta this card will be a staple for him until it rotates out. That might not happen right on release but It will eventually be a tier 1 legendary. 

 Spreading Plague

[Cries in Tolin's Goblet]

This card will flourish when Pogo Hoppers becomes META

Unidentified Contract saw no play even with pre-nerf Preparation. Not sure what type of deck will run this card in the future.

How about every rogue deck...

Vilespine Slayer saw a lots of play in every tempo decks, and Miracle too. So I would say this guy gonna sees play as long as Rogue still doing good.