A. Be able to ride rainbows.
B. Summon any food you want by snapping your fingers.
C. Become the best at every video game in the world.
D. Turn anything invisible except yourself.
[spoiler]The next WYR is going to be the stupidest/funniest one I've ever made. Stay tuned, haha. [/spoiler]
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Going with D. I can see some Loki level of entertainment coming from the power to make things invisible.