Tendrils of Agony is a uncommon Sorcery card from Mystery Booster 2 (MB2), collector number 50. Current market price: $0.27, TCGplayer market prices via Scryfall.
Target player loses 2 life and you gain 2 life. Storm (When you cast this spell, copy it for each spell cast before it this turn. You may choose new targets for the copies.)