The Ozolith [Ikoria: Lair of Behemoths] SM217 you may cast this card

you may cast this card from exile without paying its mana cost

leaving him with no way to feed his troops

This explains why the goblins remain unaffected

Set: Secret Lair Drop Series Type: Instant Rarity: Rare Cost: {U} Destroy target creature

– And more

The Ozolith [Ikoria: Lair of Behemoths] SM217 you may cast this cardSet: Ikoria: Lair of Behemoths Type: Legendary Artifact Rarity: Rare Cost: {1} Whenever a creature you control leaves the battlefield, if it had counters on it, put those counters on The Ozolith. At the beginning of combat on your turn, if The Ozolith has counters on it, you may move all counters from The Ozolith onto target creature. As it twists, so does all life around it.