Consider that common banish cards can only discard common durables. 95% of the time, your opponent is going to consider it a favour for you to discard a common for him. That, combined with the weak attack, makes this an extremely lousy card. I think it definitely needs a buff.
Maybe it could do some nice bonus damage if the banish effect procs? (Because of the order in which keywords resolve, I don't think this is possible in the most obvious sense, but you could just test whether the other player has a common durable in their hand when the card's main effect is being determined)