Mine would be invisibility so I can prank and troll the crap out of people and the sparrow so I won't have to ride my bike everywhere. Plus glide would be really fun. What would yours be?
EDIT: going for 200 replies
EDIT: wow. 300?
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Oh wait, not limited to just one? ;D OK in that case: Triple jump Blink Constant throwing knives Blade dancer Invisibility Summon sparrow Hungering blade Blink strike Dude you don't even know how set I would be for the rest of my life if I had those.