Umori, the Collector (Showcase) (062) - Multiverse Legends

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} any time you could cast a sorcery.)

As Umori, the Collector enters the battlefield, choose a card type.

Spells you cast of the chosen type cost {1} less to cast.