Voice of the Woods is a rare Creature — Elf card from Duel Decks: Elves vs. Goblins (DD1), collector number 14. Current market price: $0.25, TCGplayer market prices via Scryfall.
Tap five untapped Elves you control: Create a 7/7 green Elemental creature token with trample. (It can deal excess combat damage to the player or planeswalker it's attacking.)