mask of change booster box (sv6) [JP] – Phantom Card Shop this box is a valuable product for any collector. Pokemon Japanese Mask of Change

Keep an eye out for those from recent sets

(1) While an opponents monster is in this cards column, your opponent cannot target this card with card effects, also they cannot special summon monsters using activated monster effects (2) (Quick Effect): You can target 1 monster on the field

Siegbedingungen: Ein Spieler gewinnt, wenn die Lebenspunkte des Gegners auf Null reduziert sind, der Gegner keine Karten mehr ziehen kann oder eine spezifische Siegbedingung durch eine Karte erfllt wird

Defeat him and make sure you destroy a Metalmorph

But honestly, I think its much more interesting to try to compile your own bespoke decks that can undo their ways