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."
Whisperwood Elemental has 3 listed printings; the most valuable is the printing from FRF at US$0.29 on TCGplayer's market price. Prices below are the cheapest in-stock listing in the United States.
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