Cheapest priced copy (Avacyn Restored): $0.35 at Card Kingdom, near mint, their price list as of .
Guise of Fire 
Enchantment — Aura · Common · Avacyn Restored · #137
Enchant creature
Enchanted creature gets +1/-1 and attacks each combat if able.
Legal inCommanderModernLegacyVintagePauper
Not legal inBrawlStandardPioneer
1 printing · $0.35 to $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Avacyn Restored | 137 | Common | $0.35 | $0.49 |
2 rulings from Wizards of the Coast
- 1 May 2012The controller of the enchanted creature still decides which player or planeswalker the creature attacks.
- 1 May 2012If, during its controller’s declare attackers step, the enchanted creature is tapped, is affected by a spell or ability that says it can’t attack, or hasn’t been under that player’s control continuously since the turn began (and doesn’t have haste), then it doesn’t attack. If there’s a cost associated with having a creature attack, the player isn’t forced to pay that cost, so it doesn’t have to attack in that case either.