Umori, the Collector is a rare Legendary Creature — Ooze card from Ikoria: Lair of Behemoths (IKO), collector number 358. Current market price: $0.44 (foil $0.93), TCGplayer market prices via Scryfall.
Companion — Each nonland card in your starting deck shares a card type. (If this card is your chosen companion, you may put it into your hand from outside the game for {3} as a sorcery.) As Umori enters, choose a card type. Spells you cast of the chosen type cost {1} less to cast.