Gravestone Strider is a common Artifact Creature — Golem card from Murders at Karlov Manor (MKM), collector number 252. Current market price: $0.08 (foil $0.15), TCGplayer market prices via Scryfall.
{1}: Add one mana of any color. Activate only once each turn. {2}, Exile this card from your graveyard: Exile target card from a graveyard.