Helm of the Host (Retro Schematic) (Serialized) [The Brothers' War Retro Artifacts] Number_XY123 and can only activate them

and can only activate them while "Blue-Eyes White Dragon" is on your field or in your GY

Set: EX: Holon Phantoms Type: Psychic Rarity: Uncommon Retreat cost: Colorless

Set: Celebrations: 25th Anniversary - Classic Collection Type: Water Rarity: Holo Rare Retreat cost: Colorless

If you would proliferate

Set: EX: Crystal Guardians Type: Fighting

Helm of the Host (Retro Schematic) (Serialized) [The Brothers' War Retro Artifacts] Number_XY123 and can only activate themSet: The Brothers' War Retro Artifacts Type: Legendary Artifact Equipment Rarity: Mythic Cost: {4} At the beginning of combat on your turn, create a token that's a copy of equipped creature, except the token isn't legendary. That token gains haste. Equip {5}