I'd want a weapon of my own design;
Sheer Dumb Luck
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A sword with a large 8-ball for the center and the hilt, that has a hooked blade, and has slots on the side of the 8-ball that hold exploding cards (all aces).
That'd be my perfect weapon. If not, I want an umbrella that is indestructible, can never fold upwards, and shoots lasers out of the top.