Kinbinding is a rare Enchantment card from Lorwyn Eclipsed Promos (PECL), collector number 20p. Current market price: $0.25 (foil $0.75), TCGplayer market prices via Scryfall.
Creatures you control get +X/+X, where X is the number of creatures that entered the battlefield under your control this turn. At the beginning of combat on your turn, create a 1/1 green and white Kithkin creature token.