Skilled Dark Magician

Whenever you cast a Instant or Sorcery spell,
if Skilled Dark Magician has less than three +1/+1 counters on it, put a +1/+1 counter on Skilled Dark Magician.
{t} Remove three +1/+1 counters from Skilled Dark Magician: Add {b}{b}{b}. Spend this mana only to cast Wizard creature spells.