Super Power... With a Flaw

But when you use that ability your skin becomes transparent.

When I shot I can always hit my target dead on.

But only with a napoleonic war-era rifle, which takes at least a minute to load.

I can turn poisonous food into harmless food.

By sucking the poison out with a straw

I can create standard sized uncooked bags of popcorn wherever I want

but they already have the salt in them... and it's way too much salt.

i can temporarily disable the superpowers of anything that has them.

By licking their elbows.

I can sing slightly above avarage.

But you can't talk, only sing.

I always roll natural 20's on attacks.

Including those that would hurt my allies.

I can raise people from the dead, personality intact, and control them.

But you have to sacrifice someone to raise someone from the dead.

I can walk on water.

... But only on your hands!

I can learn a new language by reading or hearing a sentence.

... But now you can only speak that language, and you immediately forget everything about the previous language, forever

I can change my body size at my command

but if you do change your size you die

I can talk to doggos 

But only angry ones.

I can turn...

into the first word that you hear, but it's permanent.

I can manipulate the minds of those around me. 

...If you can first figure out how the human mind works well enough to do so effectively.

I can compel anybody to obey any order, which they will carry out to the best of their ability.

but it only works if you use Latin and they understand it.

I can control the weather. 

You can control the weather, but it is extremely slow and tiring to do.

I can breathe underwater and on land

But not air.

I can eat 50 gummy bears at once with no downsides or side effects.

And then you can never eat again.

I can turn invisible when I want, and visible when I want, with no side effects.

But no one can ever see you visible. (Not a side effect for you, but for them.)

I can eat without gaining weight.

& you starve to death because if you gain weight, you can't process food.

I can predict the stock market with perfect accuracy.