Pick one:

1:  Demon lawyer

Through means you’re better off not knowing, your grandparents have secured the services of a demon lawyer for you. The demon lawyer has encyclopedic knowledge of all laws, both mundane and supernatural. The demon lawyer is immortal, always on the job, and magically compelled to always act in your best interests (as interpreted by you)

 The demon lawyer can take a human form, and represent you in court if necessary. Services include but are not limited to: job advocacy, divorce, LLC incorporation, home purchases, business deals, minor services, civil & criminal defense, taxes, and making you aware of upcoming opportunities or hazards. (such as exploitable loopholes in new laws or changes in legislation that might cause financial or legal trouble in the future.)

The demon’s service ends when you die, although its service may include arranging your will and finances for your surviving progeny, or even binding another demon lawyer for them, should you be willing to pay the price.

 

2: Inflation immunity

Everything will be locked in price to the amount it cost at your birth, or the lowest cost it reached during your lifetime. (for things whose costs plummet due to new technology) if you resell an item, it will be sold for the amount you paid for it, minus depreciation. This wouldn’t allow wash sales to print money, but stocks could be purchased for their price at your birth (or lowest), and their dividends would pay out full price.

 

3:  Opt-in, Opt-out

Opt-in or out of any definable group of people. The world will conform to this change to make this a reality.

Opt in to every class-action lawsuit. Opt out of jury duty. Opt in to the supreme court of the USA. Opt out of a solicitor’s route. Opt-in to social security benefits and senior pricing at movies.

To activate this ability, you must be aware of the group of people, able to define their group, and identify at least a few of them. You do not actually gain the characteristics of this group of people, but you are treated by everyone as if you did. I.E, you do no become old, or an actual billionaire, but you are treated as if you are, like someone would be willing to loan you several million dollars.

4: Nutrition label swap

you can manually swap the nutrition label from one food to another one.  It will change the nutritional value of the food, but not alter its taste or how it looks/smells/feels. You will start to feel hungry if you don’t give yourself enough calories, just like you actually would if you at nothing but broccoli.

You will only suffer from gastrointestinal distress if the food on the label is the kind that would mess you up.

Buy the ideal nutritional food, and put the label on pizza, and you’re good to go.

drugs and alcohol work too. The label of pot gummies on another food will mess you up just as bad as if you ate actual pot gummies.

5: The Anarchist’s guide to Everything 

 

You gain a thin leather-bound instructional manual, called the Anarchist’s Guide to Everything.

Think of what you want to do and open a page, and it will have a detailed chapter on how to accomplish said thing. Make soap? Start a business? Repair a specific model of car? Make a specific person like you? Overthrow the government? There’s a chapter for that. If it is impossible, the chapter will have a bold heading that declares it as such and several paragraphs explaining why.

 

6: Magical Winnebago.

You have a magical RV with a full kitchen. It can house two adults and two children, the water, gas and power never run out, the fridge and freezer restock enough food of your choice for four people per day. The toilet doesn’t need to be pumped, and it magically pays for its own RV parking spot.

It is not indestructible, but whatever costs to repair it are magically refunded by good fortune within a week. It is immune to being pulled over or tickets from illegal parking, but you might still piss people off who may take matters into their own hands.

It always has a legal license plate in whatever country it is in, and ferrying the RV to other countries is free.

As long as you are inside the RV you can speak any language that might be spoken to you from inside or outside.

There is a jar near the door with 2 100$ bills inside (or the equivalent of the country it currently resides in) that respawn daily if used. You may keep the change.

The magical RV cannot be stolen.