Echoing Stampede

When Echoing Stampede enters the battlefield, Centaur creatures you control gain menace and rampage 1 until end of turn.
{2}{g}, Return Echoing Stampede to it's owner's hand: Reveal the top card of your library. If it's a Centaur permanent card, put it onto the battlefield. Otherwise, put it into your hand.
The celebration of a new band member can be heard for days after it.