Valkyrion the Magna Warrior (SBCB-EN022) [Speed Duel: Battle City Box]

Cannot be Normal Summoned/Set. Must first be Special Summoned (from your hand) by Tributing 1 "Alpha The Magnet Warrior", "Beta The Magnet Warrior", and "Gamma The Magnet Warrior" from your hand and/or field. You can Tribute this card, then target 1 "Alpha The Magnet Warrior", "Beta The Magnet Warrior", and "Gamma The Magnet Warrior" in your GY; Special Summon them.