Troll of Khazad-dûm

Troll of Khazad-dûm 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.)

“A great cave-troll, I think. There is no
hope of escape that way.”
—Gandalf