My Tendrils Run Deep is a common Ongoing Scheme card from Duskmourn: House of Horror Commander (DSC), collector number 345. Current market price: $0.36, TCGplayer market prices via Scryfall.
(An ongoing scheme remains face up until it's abandoned.) You may play an additional land on each of your turns. At the beginning of your end step, if you control six or more lands, draw two cards, then abandon this scheme.