Severus Snape

When Snape enters the battlefield you may put a +1/+1 counter on another Wizard or Witch creature you control.
{t}{2}{w}{b}, draw 4 cards, you may play 1 instant or sorcery card from among them for {0} if you do untap Snape and put the rest of the cards in your graveyard. If you do not, then put the 4 cards on the bottom of your library in any order.