Umori, the Collector (Halo Foil) [Multiverse Legends] Turtle Hydra Set: Commander 2017 Oversized Type:

Set: Commander 2017 Oversized Type: Legendary Creature — Human Wizard Rarity: Mythic Cost: {2}{U}{B}{R} Eminence — Whenever another nontoken Wizard enters the battlefield under your control

there is also a 40-page sourcebook (with art by Joanna Barnum)

sacrifice Koskun Falls unless you tap an untapped creature you control

Metal Color Gold

Umori, the Collector (Halo Foil) [Multiverse Legends] Turtle Hydra Set: Commander 2017 Oversized Type:Set: Multiverse Legends Type: Legendary Creature Ooze Rarity: Rare Cost: {2}{B G}{B G} 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.