Golgari Locket is a common Artifact card from Guilds of Ravnica (GRN), collector number 237. Current market price: $0.22 (foil $0.51), TCGplayer market prices via Scryfall.
{T}: Add {B} or {G}. {B/G}{B/G}{B/G}{B/G}, {T}, Sacrifice this artifact: Draw two cards.