Zerevv, the Faceless Assassin

Whenever an opponent draws a card, Zerevv, the Faceless Assassin gets +1/+1 until end of turn.
{u}{b}{r},{t}: Target player reveals their hand.
Choose a non land card. Each player discards a
card, then draws cards equal to the converted
mana cost of the chosen card.
Sometimes he finds a face he likes from a target he
kills. Other times he's just bored.