囁(ささや)きの森(もり)の精(せい)霊(れい)

At the beginning of your end step, manifest the top card of your library. (Put it onto the battlefield face down as a 2/2 creature. Turn it face up any time for its mana cost if it's a creature card.)

Sacrifice this creature: Until end of turn, face−up nontoken creatures you control gain "When this creature dies, manifest the top card of your library."