Weakwilled Angel

Flying
Whenever Weakwilled Angel deals combat damage put a -1/-1 counter on it.
Remorse - When Weakwilled Angel leaves the battlefield, if it was killed by a creature that creature gets -1/-1 counters equal to Weakwilled Angel's thoughness, if it was removed by a spell that spell's caster loses life equal to Weakwilled Angel's thoughness.