Cheapest priced copy (Shadowmoor): $0.35 at Card Kingdom, near mint, their price list as of .
Traitor's Roar 
Sorcery · Common · Shadowmoor · #200
Tap target untapped creature. It deals damage equal to its power to its controller.
Conspire (As you cast this spell, you may tap two untapped creatures you control that share a color with it. When you do, copy it and you may choose a new target for the copy.)
Legal inCommanderModernLegacyVintagePauper
Not legal inBrawlStandardPioneer
1 printing · $0.35 to $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Shadowmoor | 200 | Common | $0.35 | $0.49 |
One ruling from Wizards of the Coast
- 1 May 2008If you use conspire to copy Traitor’s Roar, but you don’t change its target, the copy will resolve just fine but the original doesn’t resolve. That’s because the copy will resolve first, and as part of its resolution, it will tap the targeted creature. Then, when the original Traitor’s Roar tries to resolve, it will have an illegal target (since it must target an untapped creature).