doesnt impact board, your opponent is then free to answer it with sap/hex/sheep/silence/zephrys etc.
It's just bad. 10 mana minions dont see play unless they basically swing the game in your favor. If you play this while being behind, you probably lose anyway. If you play this on empty board you probably would win anyway so it's a win more card at best.
I really can only see it being played as a 1-off in Plot Twist Warlock as it synergizes well enough with Fel Lord Betrug, but with cards like Dollmaster Dorian rotating, it loses a lot of its oomph. If cloning gallery was not rotating, I could see it as a 1-off there as well. Monster in Arena, mediocre in Standard.