Tomb Hex is a common Instant card from Worldwake (WWK), collector number 69. Current market price: $0.18 (foil $0.25), TCGplayer market prices via Scryfall.
Target creature gets -2/-2 until end of turn. Landfall — If you had a land enter the battlefield under your control this turn, that creature gets -4/-4 until end of turn instead.