Pharika's Cure deals 2 damage to target creature and you gain 2 life.
"The venom cleanses the sickness from your body, but it will not be pleasant, and you may not survive. Pharika's blessings are fickle." —Solon, acolyte of Pharika
Official Rulings for Pharika's Cure
9/15/2013 : If the creature is an illegal target as Pharika’s Cure tries to resolve, it will be countered and none of its effects will happen. You won’t gain life. If, on the other hand, Pharika’s Cure does resolve but the damage is prevented, you’ll still gain life.