sinon card sleeves Sword Art Online II Phantom Bullet Small Deck Protector 60ct one of the iconic characters from the series Official Card Sleeves 02 :

During your opponent's turn (Quick Effect): You can target 1 "Therion" card in your Spell & Trap Zone and 1 card your opponent controls

You can Pay 1000 LP, target 1 monster you control and 1 card your opponent controls in order to banish them

With its spacious interior, it can hold up to 100 double-sleeved cards, meaning you'll never have to leave any cards behind

you can only declare an attack with this card for the rest of this turn, also this card gains ATK equal to the combined original ATK of all other face-up monsters on the field, then, if this card has a DARK Xyz Monster as material, negate the effects of all other face-up monsters on the field

The restrictions hold it back too much

Gadgets topped some of their very first events in 2007 thanks to the consistency and card advantage the deck naturally offered thanks to each monsters search ability