So this is essentially a 2-mana cheaper Faceless Manipulator, that is always a 3/3? It's stronger when copying low-mana minions, but weaker when copying high-mana minions (unless you're just after the effect, then it's simply an improved Faceless)
It could be fun as a combo card in some weird wild deck, but as a card in constructed? Really bad. Prince Keleseth has uses in Handbuff Paladin, but this has nothing.
Thinking about popular decks right now, they all have very good or nearly essential 3 mana cards. It's a cheaper Faceless Manipulator, but for two more mana I would rather just run that and other good cards. Like I said, fun as a combo card (PO/Leeroy/Faceless combo with this? Emperor Thaurissan tick on every piece including this, it becomes an OTK instead of 20 damage oh right 3/3 copy nevermind it's even worse), but bad otherwise.