Cheapest priced copy (Guildpact): $0.35 at Card Kingdom, near mint, their price list as of .
Beastmaster's Magemark 
Enchantment — Aura · Common · Guildpact · #80
Enchant creature
Creatures you control that are enchanted get +1/+1.
Whenever a creature you control that's enchanted becomes blocked, it gets +1/+1 until end of turn for each creature blocking it.
Legal inCommanderModernLegacyVintagePauper
Not legal inBrawlStandardPioneer
1 printing · $0.35 to $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Guildpact | 80 | Common | $0.35 | $0.49 |