Sinsiter Serpent is 🔥 with the new errata (Banishes itself during the opponent's End Phase after the effect is used, and can only be used once per turn)
Well there is no Metamorphosis, Graceful Charity etc.
Right now, in this game - especially with his nerfs - he is not that useful. So i can understand that he's a rare. However, if i look at some other cards beeing SR...