MirrorBall is an unusual deck that actually wants the player to take damage, but in controlled forms of course. Why? you may ask. The answer is quite simple, you want to use your life as a resource to put yourself ahead of the opponent and then use Mirror Universe to change life total with him or her. The main card the deck uses for this purpose is Sylvan Library but there are other good cards as well.
Channel lets you convert your life into mana and Force of Nature is a formidable finisher, especially when you can skip paying the upkeep cost. Last but not least, if you don't include a Force of Nature don't forget to put in another wincon that you can use after you change life total.