The Mending of Dominaria is a rare Enchantment — Saga card from Dominaria Promos (PDOM), collector number 173s. Current market price: — (foil $2.26), TCGplayer market prices via Scryfall.
(As this Saga enters and after your draw step, add a lore counter. Sacrifice after III.) I, II — Mill two cards, then you may return a creature card from your graveyard to your hand. III — Return all land cards from your graveyard to the battlefield, then shuffle your graveyard into your library.