Masked HERO Blast [JUMP-EN078] Ultra Rare Blast Ace Promos Special Summon 1 Level 4

Special Summon 1 Level 4 "Mathmech" monster from your hand or GY

You lose 1 life

Set: The Brothers' War Retro Artifacts Type: Artifact Rarity: Uncommon Cost: {1} At the beginning of your upkeep

Whenever this creature deals combat damage to an opponent

Set: Kaldheim Prerelease Promos Type: Creature — Demon Berserker Rarity: Mythic Cost: {4}{B}{B} Flying

Masked HERO Blast [JUMP-EN078] Ultra Rare Blast Ace Promos Special Summon 1 Level 4Set: Shonen Jump Magazine Promos Card type: Fusion Effect Monster Rarity: Ultra Rare Attack: 2200 Defense: 1800 Must be Special Summoned with "Mask Change" and cannot be Special Summoned by other ways. If this card is Special Summoned: You can target 1 face up monster your opponent controls; its ATK becomes half its current ATK. Once per turn, during either player's turn: You can pay 500 LP, then target 1 Spell Trap Card your opponent controls; return