Cheapest priced copy (Visions): $0.35 at Card Kingdom, near mint, their price list as of .
Mob Mentality 
Enchantment — Aura · Uncommon · Visions · #88
Enchant creature
Enchanted creature has trample.
Whenever all non-Wall creatures you control attack, enchanted creature gets +X/+0 until end of turn, where X is the number of attacking creatures.
Legal inCommanderLegacyVintage
Not legal inBrawlStandardPioneerModernPauper
1 printing · $0.35 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Visions | 88 | Uncommon | $0.35 | — |