Voice of the Woods is a rare Creature — Elf card from Onslaught (ONS), collector number 297. Current market price: $0.57 (foil $5.21), 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.)