Cheapest priced copy (Magic 2012): $0.49 at Card Kingdom, near mint, their price list as of .
Goblin Bangchuckers 
Creature — Goblin Warrior · 2/2 · Uncommon · Magic 2012 · #137
{T}: Flip a coin. If you win the flip, this creature deals 2 damage to any target. If you lose the flip, this creature deals 2 damage to itself.
Legal inCommanderModernLegacyVintage
Not legal inBrawlStandardPioneerPauper
1 printing · $0.49 to $0.79 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Magic 2012 | 137 | Uncommon | $0.49 | $0.79 |
2 rulings from Wizards of the Coast
- 22 September 2011If the permanent or player is an illegal target when Goblin Bangchuckers’ ability tries to resolve, it won’t resolve and none of its effects will happen. You won’t flip a coin and no damage will be dealt.
- 22 September 2011You choose the target when you activate the ability. You don’t flip the coin until the ability resolves. Players may respond to the ability, but they won’t know the results of the coin flip.