Seriously though it could be decent in silence priest and not much else on first glance.
I don't understand you people. Like, have you ever actually played silence priest? It doesn't give a shit about silencing a 2/2 on turn 4 just so your opponent doesn't get a 5/5. Come on now.
This card is unplayable. Even giving it to your opponent doesn't seem very good. Paying 4 mana for this, then 3 mana to give to your opponent, then trading into it or spending even more mana on this play! All for 2 5/5 minions. If you want 5/5s on turn 7 that badly, you should just play quest rogue.