Banner of Kinship is a rare Artifact card from Foundations (FDN), collector number 352. Current market price: $10.83 (foil $15.44), TCGplayer market prices via Scryfall.
As this artifact enters, choose a creature type. This artifact enters with a fellowship counter on it for each creature you control of the chosen type. Creatures you control of the chosen type get +1/+1 for each fellowship counter on this artifact.