Worldknit is a rare Conspiracy card from Conspiracy (CNS), collector number 13. Current market price: $0.40 (foil $2.27), TCGplayer market prices via Scryfall.
(Start the game with this conspiracy face up in the command zone.) As long as every card in your card pool started the game in your library or in the command zone, lands you control have "{T}: Add one mana of any color."