Rakdos Locket is a common Artifact card from Ravnica Allegiance (RNA), collector number 237. Current market price: $0.21 (foil $0.62), TCGplayer market prices via Scryfall.
{T}: Add {B} or {R}. {B/R}{B/R}{B/R}{B/R}, {T}, Sacrifice this artifact: Draw two cards.