Horrific Assault is a common Sorcery card from Modern Horizons 3 (MH3), collector number 157. Current market price: $0.21 (foil $0.26), TCGplayer market prices via Scryfall.
Target creature you control deals damage equal to its power to target creature or planeswalker you don't control. If you control an Eldrazi, you gain 3 life.