Cheapest priced copy (Mirrodin): $0.35 at Card Kingdom, near mint, their price list as of .
Incite War 
Instant · Common · Mirrodin · #96
Choose one —
• Creatures target player controls attack this turn if able.
• Creatures you control gain first strike until end of turn.
Entwine {2} (Choose both if you pay the entwine cost.)
Legal inCommanderModernLegacyVintagePauper
Not legal inBrawlStandardPioneer
1 printing · $0.35 to $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Mirrodin | 96 | Common | $0.35 | $0.49 |