Troll of Khazad-dûm is a common Creature — Troll card from The Hobbit Commander (HOC), collector number 191. Current market price: $6.77, TCGplayer market prices via Scryfall.
This creature can't be blocked except by three or more creatures. Swampcycling {1} ({1}, Discard this card: Search your library for a Swamp card, reveal it, put it into your hand, then shuffle.)