Archfiend of Despair [Battlebond] Black Star Promo you can substitute this card

you can substitute this card for any 1 "Synchron" Tuner monster

This card cannot be Special Summoned except by removing from play 7 DARK monsters with different names from your Graveyard

your opponent cannot activate and Magic or Trap cards until the end of damage step

Set: Black & White: Legendary Treasures Type: Grass Rarity: Ultra Rare Retreat cost: Colorless

Archfiend of Despair [Battlebond] Black Star Promo you can substitute this cardSet: Battlebond Type: Creature Demon Rarity: Mythic Cost: {6}{B}{B} Flying Your opponents can't gain life. At the beginning of each end step, each opponent loses life equal to the life that player lost this turn. (Damage causes loss of life.)