Cheapest priced copy (Khans of Tarkir): $0.35 at Card Kingdom, near mint, their price list as of .
Siegecraft 
Enchantment — Aura · Common · Khans of Tarkir · #23
Enchant creature
Enchanted creature gets +2/+4.
Legal inCommanderPioneerModernLegacyVintagePauper
Not legal inBrawlStandard
2 printings · $0.35 to $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Khans of Tarkir | 23 | Common | $0.35 | $0.49 |
| The List | KTK-23 | Common | $0.35 | — |