Cheapest priced copy (Return to Ravnica): $0.35 at Card Kingdom, near mint, their price list as of .
Centaur's Herald 
Creature — Elf Scout · 0/1 · Common · Return to Ravnica · #118
{2}{G}, Sacrifice this creature: Create a 3/3 green Centaur creature token.
Legal inCommanderPioneerModernLegacyVintagePauper
Not legal inBrawlStandard
1 printing · $0.35 to $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Return to Ravnica | 118 | Common | $0.35 | $0.49 |
2 rulings from Wizards of the Coast
- 1 October 2012You can only sacrifice Centaur’s Herald once, so it’s not possible to activate its ability more than once.
- 1 October 2012Once you activate the ability of Centaur’s Herald, it’s too late for a player to respond by trying to destroy it or otherwise stop you from sacrificing it.