Cheapest priced copy (The List): $0.35 at Card Kingdom, near mint, their price list as of .
Goblin Grenadiers 
Creature — Goblin · 2/2 · Uncommon · Weatherlight · #104
Whenever this creature attacks and isn't blocked, you may sacrifice it. If you do, destroy target creature and target land.
Legal inCommanderLegacyVintage
Not legal inBrawlStandardPioneerModernPauper
2 printings · $0.35 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| The List | WTH-104 | Uncommon | $0.35 | — |
| Weatherlight | 104 | Uncommon | $0.35 | — |
3 rulings from Wizards of the Coast
- 1 April 2008A permanent that’s both a land and a creature may be chosen as both of this ability’s targets.
- 1 April 2008Both a creature and a land must be targeted when the ability triggers. If there aren’t enough legal targets, the ability doesn’t go on the stack and Goblin Grenadiers can’t be sacrificed this way.
- 15 April 2013An ability that triggers when something “attacks and isn’t blocked” triggers in the declare blockers step after blockers are declared if (1) that creature is attacking and (2) no creatures are declared to block it. It will trigger even if that creature was put onto the battlefield attacking rather than having been declared as an attacker in the declare attackers step.