Cheapest priced copy (Mirage): $0.35 at Card Kingdom, near mint, their price list as of .
Shadowbane 
Instant · Uncommon · Mirage · #38
The next time a source of your choice would deal damage to you and/or creatures you control this turn, prevent that damage. If damage from a black source is prevented this way, you gain that much life.
Legal inCommanderLegacyVintage
Not legal inBrawlStandardPioneerModernPauper
1 printing · $0.35 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Mirage | 38 | Uncommon | $0.35 | — |
One ruling from Wizards of the Coast
- 1 August 2008This only prevents damage the chosen source would deal to you or a creature you control. If the creature would deal damage to another player, a planeswalker, or a creature you don’t control, it does not get prevented.