Jodah, the Unifier is a mythic Legendary Creature — Human Wizard card from Dominaria United Promos (PDMU), collector number 203p. Current market price: $3.29 (foil $4.32), TCGplayer market prices via Scryfall.
Legendary creatures you control get +X/+X, where X is the number of legendary creatures you control. Whenever you cast a legendary spell from your hand, exile cards from the top of your library until you exile a legendary nonland card with lesser mana value. You may cast that card without paying its mana cost. Put the rest on the bottom of your library in a random order.