Vaneffica, Wings Clipped

Whenever you cast a Curse spell, you draw a card and you lose 1 life.
{w}{u}{b}: Create a white, blue, and black Aura Curse enchantment token attached to target opponent. The token has enchant player and "At the beginning of enchanted player's upkeep, that player mills a card, loses 1 life and you gain 1 life.