Cheapest priced copy (Conspiracy): $0.35 at Card Kingdom, near mint, their price list as of .
Heckling Fiends 
Creature — Devil · 2/2 · Uncommon · Conspiracy · #145
{2}{R}: Target creature attacks this turn if able.
Legal inCommanderModernLegacyVintage
Not legal inBrawlStandardPioneerPauper
2 printings · $0.35 to $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Conspiracy | 145 | Uncommon | $0.35 | $0.49 |
| Dark Ascension | 92 | Uncommon | $0.35 | $0.49 |
2 rulings from Wizards of the Coast
- 22 January 2011The creature’s controller still decides which player or planeswalker the creature attacks.
- 22 January 2011If, during a player’s declare attackers step, a 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.