Niv-Mizzet, The Oilmind

Ward{3},Flying
Whenever a player draws a card you may put an
oil counter on Niv-Mizzet
{t} Remove X oil counters from Niv-Mizzet, Then counter target
instant or sorcery spell with mana cost equal to X
{t}Remove X oil counters from Niv-Mizzet, Then
Niv-Mizzet deals X damage to target creature.
That creature’s controller gets a poison counter