Meklord Emperor Wisel (JUMP-EN053) [Shonen Jump Magazine Promos]

Cannot be Normal Summoned or Set. Must be Special Summoned by its own effect, and cannot be Special Summoned by other ways. When a face-up monster you control is destroyed by a card effect and sent to the Graveyard: You can Special Summon this card (from your hand). Other monsters you control cannot declare an attack. Once per turn: You can target 1 Synchro Monster your opponent controls; equip that target to this card. This card gains ATK equal to those equipped monsters' combined ATK. Once per turn, when an opponent's Spell Card is activated: You can negate the activation and destroy it.