Niv-Mizzet's Spawn

{r}{r}{r}{t}: Spawn deals X damage to target
creature, player, or Planeswalker. Where X
is the number of instants and sorceries in
your graveyard.
{u}{u}{u}{t}: Draw X cards. Where X is equal
to the number of instants and sorceries in
your graveyard. Spawn doesn't untap
during your next untap step.