Boros Locket is a common Artifact card from Guilds of Ravnica (GRN), collector number 231. Current market price: $0.22 (foil $0.43), TCGplayer market prices via Scryfall.
{T}: Add {R} or {W}. {R/W}{R/W}{R/W}{R/W}, {T}, Sacrifice this artifact: Draw two cards.