Sorrow Song

As an additional cost to Sorrow Song, pay 4, 5, 6, or 10 life. Choose one -
- If you paid 4 life, target creature gets -4/-4.
- If you paid 5 life, target creature gets -4/-4,
then put a 1/1 blue and black Harpy creature token with flying onto the battlefield.
- If you paid 6 life, destroy target creature, then draw a card.
- If you paid 10 life, destroy all nonland permanents, then put five 1/1 blue and black Harpy creature tokens onto the battlefield.