Cabal Pit is a uncommon Land card from Odyssey (ODY), collector number 315. Current market price: $1.36 (foil $197.38), TCGplayer market prices via Scryfall.
{T}: Add {B}. This land deals 1 damage to you. Threshold — {B}, {T}, Sacrifice this land: Target creature gets -2/-2 until end of turn. Activate only if there are seven or more cards in your graveyard.