Cheapest priced copy (Mirage): $11.99 at Card Kingdom, near mint, their price list as of .
Withering Boon 
Instant · Uncommon · Mirage · #152
As an additional cost to cast this spell, pay 3 life.
Counter target creature spell.
Legal inCommanderLegacyVintage
Not legal inBrawlStandardPioneerModernPauper
1 printing · $11.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Mirage | 152 | Uncommon | $11.99 | — |
2 rulings from Wizards of the Coast
- 1 November 2005The payment of 3 life is an additional cost of casting the spell.
- 1 April 2008A “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.