Cheapest priced copy (Duel Decks: Speed vs. Cunning): $0.35 at Card Kingdom, near mint, their price list as of .
Hellraiser Goblin 
Creature — Goblin Berserker · 2/2 · Uncommon · Gatecrash · #95
Creatures you control have haste and attack each combat if able.
Legal inCommanderPioneerModernLegacyVintage
Not legal inBrawlStandardPauper
2 printings · $0.35 to $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Duel Decks: Speed vs. Cunning | 7 | Uncommon | $0.35 | — |
| Gatecrash | 95 | Uncommon | $0.35 | $0.49 |
2 rulings from Wizards of the Coast
- 24 January 2013Hellraiser Goblin's ability also affects itself. If it enters before combat, it will have to attack that combat if able.
- 24 January 2013If, during your declare attackers step, a creature you control is tapped or is affected by a spell or ability that says it can't attack, then it doesn't attack. If there's a cost associated with having a creature attack, you aren't forced to pay that cost, so it doesn't have to attack in that case either.