Cheapest priced copy (Oath of the Gatewatch): $0.35 at Card Kingdom, near mint, their price list as of .
Dazzling Reflection 
Instant · Common · Oath of the Gatewatch · #17
You gain life equal to target creature's power. The next time that creature would deal damage this turn, prevent that damage.
Legal inCommanderPioneerModernLegacyVintagePauper
Not legal inBrawlStandard
1 printing · $0.35 to $1.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Oath of the Gatewatch | 17 | Common | $0.35 | $1.99 |
2 rulings from Wizards of the Coast
- 22 January 2016If two Dazzling Reflections targeting the same creature have resolved in the same turn, only one prevention effect will apply the next time it would deal damage. The other effect will apply if the creature would deal damage a second time later that turn.
- 22 January 2016You gain the life as soon as Dazzling Reflection resolves, not as the damage is prevented.