Sorcery, R (1)
Common (C1)
As an additional cost to cast Goblin Grenade, sacrifice a Goblin.
Goblin Grenade deals 5 damage to target creature or player.
"I don't suppose we could teach them to throw the cursed things?"
—Ivra Jursdotter
Illus. Dan Frazier

10/4/2004: You can't sacrifice more than one Goblin to get a greater effect.
9/22/2011: Players can only respond once Goblin Grenade has been cast and all its costs have been paid. No one can try and destroy the Goblin to prevent you from casting Goblin Grenade.
9/22/2011: The Goblin you sacrifice to cast Goblin Grenade doesn't have to be a creature. For example, you could sacrifice Boggart Shenanigans (a tribal enchantment with the subtype Goblin).
Legal in Vintage (Type 1)
Legal in Legacy (Type 1.5)
Legal in Extended (Type 1.X)
Legal in Classic (MTGO)
Legal in Commander
Legal in Modern