Kozilek, Sculptor of Planes

When you cast this spell, draw cards equal to the amount of mana in your mana pool.
Menace, Incomprehensible 2, Annihilator 2.
(This creature cannot be blocked by creatures
with a converted mana cost two or less, when
this creature attacks, defending player sacrifices two permanents.)
Wjenever you lose unspent mana, draw that
many cards.