Forsaken Monument is a mythic Legendary Artifact card from Modern Horizons 3 Commander (M3C), collector number 293. Current market price: $6.36, TCGplayer market prices via Scryfall.
Colorless creatures you control get +2/+2. Whenever you tap a permanent for {C}, add an additional {C}. Whenever you cast a colorless spell, you gain 2 life.