Gollum, Riddle Master (HOB-070) [The Hobbit]

As Gollum enters, choose odd or even. (Zero is even.)

Whenever an opponent casts a spell with mana value of the chosen quality, choose one that hasn't been chosen —

• Put a +1/+1 counter on Gollum.

• Each opponent loses 2 life and you gain 2 life.

• Draw a card.