Professor Onyx [Strixhaven: School of Mages Prerelease Promos] Kor Cleric that source's controller sacrifices that

that source's controller sacrifices that many permanents

b) Play a Card: Each player is building and populating a city

sacrifice Solitary Confinement unless you discard a card

(This is treated as an Xyz Summon

Professor Onyx [Strixhaven: School of Mages Prerelease Promos] Kor Cleric that source's controller sacrifices thatSet: Strixhaven: School of Mages Prerelease Promos Type: Legendary Planeswalker Liliana Rarity: Mythic Cost: {4}{B}{B} Magecraft Whenever you cast or copy an instant or sorcery spell, each opponent loses 2 life and you gain 2 life. +1: You lose 1 life. Look at the top three cards of your library. Put one of them into your hand and the rest into your graveyard. 3: Each opponent sacrifices a creature with the greatest power among creatures that player