Withering Boon
Mirage — Uncommon
Instant
Withering Boon rulings:
2008-04-01: A “creature spell” is any spell with the type Creature, even if it has other types such as Artifact or Enchantment. Older cards of type Summon are also Creature spells.
2005-11-01: The payment of 3 life is an additional cost of casting the spell.