Bothersome Noisemaker is a uncommon Creature — Goblin Bard card from The Hobbit (HOB), collector number 89. Current market price: $0.26 (foil $0.29), TCGplayer market prices via Scryfall.
Whenever you cast a noncreature spell, amass Goblins 1. (Put a +1/+1 counter on an Army you control. It's also a Goblin. If you don't control an Army, create a 0/0 black Goblin Army creature token first.)