Beledros Witherbloom (Promo Pack) [Strixhaven: School of Mages Promos] Sorcery Creatures you don't control get

Creatures you don't control get -1/-1 for each slime counter on them

or Vehicle spell

When Nazgûl enters the battlefield

each other creature you control with base power and toughness 1/1 gets +X/+X until end of turn

Beledros Witherbloom (Promo Pack) [Strixhaven: School of Mages Promos] Sorcery Creatures you don't control getSet: Strixhaven: School of Mages Promos Type: Legendary Creature Elder Dragon Rarity: Mythic Cost: {5}{B}{G} Flying At the beginning of each upkeep, create a 1 1 black and green Pest creature token with "When this creature dies, you gain 1 life." Pay 10 life: Untap all lands you control. Activate only once each turn.