Nightmare [30th Anniversary Edition] Artist_Naoki Saito it loses ATK equal to

it loses ATK equal to that battle damage

The Pokémon TCG: Mimikyu Pin Collection includes:

Set: Unknown Event Type: Creature — Vedalken Artificer Rarity: Common Cost: {1}{U} Spells you cast have affinity for artifact creatures that weren't originally artifact creatures

2× Lapras

Nightmare [30th Anniversary Edition] Artist_Naoki Saito it loses ATK equal toSet: 30th Anniversary 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.