Vampire Hemomancer

First Strike, Infect (If this creature deals combat damage to another creature put that many -1/-1 counters on it instead.)
If this creature deals damage to a non-artifact
creature this turn, place X +1/+1 counters on her, where X is equal to that creatures' power.
{t}, Remove X +1/+1 counters from Vampire Hemomancer, you may cast a instant or sorcery card where X is equal to that cards converted mana cost from y