Empty the Pits is a mythic Instant card from Khans of Tarkir (KTK), collector number 72. Current market price: $0.74 (foil $1.48), TCGplayer market prices via Scryfall.
Delve (Each card you exile from your graveyard while casting this spell pays for {1}.) Create X tapped 2/2 black Zombie creature tokens.