Being able to shape reality to my will. You don't need anything else. Don't want to age? Done. What a fire? Create one out of nothing. Want to know other people's thoughts? Make it so that they broadcast it to you. Want to know the future? Travel forward in time, see what's going on, then travel back. Its essentially a catch all power.
But for those of you who think I'm a game-breaker, then I post other ones:
1. Shapeshifting
2. Rapid Regeneration
3. Telepathy
4. Telekinesis
Obviously I'd need the mass to shapeshift or regenerate properly, but that just means that I would need to eat alot. And I've always wanted mind powers.