Sound the Trumpets is a uncommon Instant card from The Hobbit (HOB), collector number 55. Current market price: $0.12 (foil $0.26), TCGplayer market prices via Scryfall.
Counter target spell. If that spell's mana value was 2 or less, recruit. (Draw a card, then discard a card. If you discarded a nonland card, create a 1/1 white Human Soldier creature token.)