Cheapest priced copy (Gatecrash): $0.35 at Card Kingdom, near mint, their price list as of .
Killing Glare 
Instant · Uncommon · Gatecrash · #70
Destroy target creature with power X or less.
Legal inCommanderPioneerModernLegacyVintage
Not legal inBrawlStandardPauper
2 printings · $0.35 to $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Gatecrash | 70 | Uncommon | $0.35 | $0.49 |
| Foundations Jumpstart | 120 | Uncommon | $0.35 | — |
One ruling from Wizards of the Coast
- 24 January 2013The power of the target creature is checked both as you target it and as Killing Glare resolves. If its power is greater than the value chosen for X when Killing Glare tries to resolve, it won't resolve and none of its effects will happen.