Monstrous Emergence is a common Sorcery card from Duskmourn: House of Horror (DSK), collector number 191. Current market price: $0.23 (foil $0.26), TCGplayer market prices via Scryfall.
As an additional cost to cast this spell, choose a creature you control or reveal a creature card from your hand. Monstrous Emergence deals damage equal to the power of the creature you chose or the card you revealed to target creature.