I think this is a good card in general, however I am not really sure if rogues will use it.
It's just that rogue is a tempo class and Sap does a better job in this regard. Normally a rogue player doesn't care about killing the minion, they just want to hinder the opponent's tempo and put them in a tough position. Miracle rogue used to run Sap. I am almost sure, that if odd rogue had the chance, they would also run it. The thing about Assassinate is that it's too expensive for this class. Rogue can't play the slow game, so they don't need this removal. Walk the Plank is cheaper, but still more expensive that Sap.
Imho if we will see it in play - it will only be used in even pirate rogue (if this becomes a thing). I am very skeptical that a miracle rogue would use it. Tess rogue needs a board clear.
Cant tess rogue run pyro + plague scientist as board clear? That deck already has a lot of card draw to make it work.
Why do we need to add more tools, which are crushing against big minions and weak against wide boards of small shit? Pretty mich since GvG we had the Situation that playing anything above 5 mana had to be pretty dam op in order to justify the prive tag and with more cards like this, it will most likely stay this way.