Professor Onyx [Strixhaven: School of Mages Prerelease Promos] DP56 sacrifice Contamination unless you sacrifice

sacrifice Contamination unless you sacrifice a creature

create a 0/0 colorless Construct artifact creature token with "This creature gets +1/+1 for each artifact you control

Set: Box Topper Type: Fire Rarity: Promo Retreat cost: Colorless

Set: Unlimited Edition Type: Sorcery Rarity: Rare Cost: {X}{R} Earthquake deals X damage to each creature without flying and each player

And *Homelands*

Professor Onyx [Strixhaven: School of Mages Prerelease Promos] DP56 sacrifice Contamination unless you sacrificeSet: 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