Mirana is my favorite hero, and this is how I like to play her. While she can fill a multitude of roles effectively, I've found that she works as a 1 or 2 position carry very well. Early game, you should focus primarily on farming and ganking, especially if you're mid. If you follow this guide, by mid game you should be able to right click down squishy heroes and win teamfights with a good initiation. Late game, you should have enough farm to easily push down towers and win teamfights to secure your victory