Yugioh [AC03-JP004] Colorless, Chaos King of Dark World (Ultra Rare)

"Reign-Beaux, Overlord of Dark World" + 2+ Fiend monsters

If this card is Fusion Summoned: You can destroy all cards your opponent controls. This card's original Attack/Defense become the number of Fusion Materials used for its Summon x 1000. Once per turn (Quick Effect): You can target 1 face-up card you control; discard 1 card, also your opponent cannot target that face-up card with card effects this turn.