Grisly Sigil is a uncommon Sorcery card from Streets of New Capenna (SNC), collector number 82. Current market price: $0.15 (foil $0.04), TCGplayer market prices via Scryfall.
Casualty 1 (As you cast this spell, you may sacrifice a creature with power 1 or greater. When you do, copy this spell and you may choose a new target for the copy.) Choose target creature or planeswalker. If it was dealt noncombat damage this turn, Grisly Sigil deals 3 damage to it and you gain 3 life. Otherwise, Grisly Sigil deals 1 damage to it and you gain 1 life.