Camus, Aquarius Wizard

{u}{b}{t}: Add {u/b}{u/b}{u/b} at your mana pool.
On each upkeep, if Camus, Aquarius Wizard is tapped, put a -1/-1 counter on all target player's creatures.
{4}{u}{b},{t}: Remove four -1/-1 counters from opponents' creatures: Draw two cards and target player loses 4 life.