Howltooth Hollow is a rare Land card from Lorwyn (LRW), collector number 269. Current market price: $0.61 (foil $3.10), TCGplayer market prices via Scryfall.
Hideaway 4 (When this land enters, look at the top four cards of your library, exile one face down, then put the rest on the bottom in a random order.) This land enters tapped. {T}: Add {B}. {B}, {T}: You may play the exiled card without paying its mana cost if each player has no cards in hand.