Centaur's Herald

Oracle Text

2G, Sacrifice Centaur's Herald: Create a 3/3 green Centaur creature token.

Card Rulings

10/1/2012 Once 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.
10/1/2012 You can only sacrifice Centaur’s Herald once, so it’s not possible to activate its ability more than once.