Path of Ancestry is a common Land card from March of the Machine Commander (MOC), collector number 418. Current market price: $0.35, TCGplayer market prices via Scryfall.
This land enters tapped. {T}: Add one mana of any color in your commander's color identity. When that mana is spent to cast a creature spell that shares a creature type with your commander, scry 1. (Look at the top card of your library. You may put that card on the bottom.)