Every single one of my Goblin decks runs at least 2 copies of this, if not 4. Trading a 1/1 Goblin (usually a token) for 5 damage is just awesome. Trading a 1/1 Goblin (usually a token) for 5 damage that's just dealt combat damage to a player is more awesome. I love using this card in conjunction with Boggart Shenanigans for even more damage. No one who I play against likes seeing this card. The only drawback is that you have to sack a Goblin for it, but in 99% of cases, the martyred creature will be a nameless token.
Pros: Trades a Goblin for 5 damage for 1
Cons: Might have to sack a worthwhile Goblin in a pinch