Equip only to your Dragon Synchro Monster.
(1) “Red Dragon Archfiend” equipped with this card is unaffected by your opponent’s activated card effects.
(2) Once per turn: You can change the ATK of all face-up monsters your opponent currently controls to the equipped monster’s.
(3) Once per turn, when an attack is declared involving the equipped monster: You can target 1 monster in your opponent’s GY; banish it, and if you do, the equipped monster gains ATK equal to the banished monster’s until the end of this turn.