Gremlin Mine is a common Artifact card from New Phyrexia (NPH), collector number 136. Current market price: $0.07 (foil $0.32), TCGplayer market prices via Scryfall.
{1}, {T}, Sacrifice this artifact: It deals 4 damage to target artifact creature. {1}, {T}, Sacrifice this artifact: Remove up to four charge counters from target noncreature artifact.