Zero Point Ballad is a rare Sorcery card from Edge of Eternities Promos (PEOE), collector number 128p. Current market price: $0.32 (foil $0.45), TCGplayer market prices via Scryfall.
Destroy all creatures with toughness X or less. You lose X life. If X is 6 or more, return a creature card put into a graveyard this way to the battlefield under your control.