Nightmare [Unlimited Edition] Advent Calendar 2019 before damage calculation inflict damage

before damage calculation inflict damage to your opponent equal to that monster's ATK

and/or "Dark Magician Girl"

that player sacrifices a permanent unless they pay {1}

where X is that creature's power

Nightmare [Unlimited Edition] Advent Calendar 2019 before damage calculation inflict damageSet: Unlimited Edition Type: Creature Nightmare Horse Rarity: Rare Cost: {5}{B} Flying (This creature can't be blocked except by creatures with flying or reach.) Nightmare's power and toughness are each equal to the number of Swamps you control. The Nightmare arises from its lair in the swamps. As the poisoned land spreads, so does the Nightmare's rage and terrifying strength.