Umori, the Collector (MUL-062) - Multiverse Legends: (Showcase) (Borderless)

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 as a sorcery.)
As Umori, the Collector enters, choose a card type.
Spells you cast of the chosen type cost less to cast.