Cheapest priced copy (Fifth Edition): $0.35 at Card Kingdom, near mint, their price list as of .
Soul Barrier 
Enchantment · Common · Fifth Edition · #125
Whenever an opponent casts a creature spell, this enchantment deals 2 damage to that player unless they pay {2}.
Legal inCommanderLegacyVintagePauper
Not legal inBrawlStandardPioneerModern
2 printings · $0.35 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Fifth Edition | 125 | Common | $0.35 | — |
| Ice Age | 103 | Uncommon | $0.35 | — |
One ruling from Wizards of the Coast
- 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.