Fear (Retro) [30th Anniversary Edition] XY02 [Auto] [Once per turn] When

[Auto] [Once per turn] When your opponent declares to play a Battle Card or activates a skill that puts Battle Cards into play

This is the Demon's work

000 Type: Legendary Artifact Creature — Necron Rarity: Mythic Cost: {1}{B}{B}{B} Flying

if it's attacking the player with the most life or tied for most life

Set: Sun & Moon: Team Up Type: Item Rarity: Secret Rare

Fear (Retro) [30th Anniversary Edition] XY02 [Auto] [Once per turn] WhenSet: 30th Anniversary Edition Type: Enchantment Aura Rarity: Common Cost: {B}{B} Enchant creature (Target a creature as you cast this. This card enters the battlefield attached to that creature.) Enchanted creature has fear. (It can't be blocked except by artifact creatures and or black creatures.)