You're given a superpower. The ability to magically heal. Any disease, any ailment, any condition. They're healed the next day, so you can use this power inconspicuously if you wanted. There's no limit per healings per day, but there is a price to pay. For every 20 people you heal, you must take the life of 1 person. For you, it's easy. You just look at them and mentally push a button, and the next day, they don't wake up, so you're never a suspect. You can do this with people on tv too. So, you could kill 100 people, and heal 2,000. Also, the credit you get per kill doesn't expire, so you could whack the serial rapist who's shown on the news and just save the 20 heals for yourself whenever you need it. How often would you use this power?
You're given a superpower. The power of teleportation! You can teleport anywhere in the world. You don't even have to know the layout beforehand. Your power lands you within a foot of the nearest solid object, so you'll never materialize inside a wall, let's say. You can look at a picture and teleport to that spot. Otherwise, just picture the image in your head. The only drawback is that each time you 'jump', 1 day of your life gets removed, so if you teleport 30 times, you'll die 30 days sooner than you would normally (whenever that may be). How often would you use this power?
You're given the Green Lantern ring! You can make anything with your thoughts, depending on your willpower. The only thing is, every time you use this power, the flashy Green Lantern costume appears on your body, regardless of how insignificant the action may be. So, pretty much it's hard to keep a low profile when you're out in public. How would you use this ring?