User blog comment:GimmeStarfoxWii/If you could have the powers/abilities of any League champion.../@comment-3974211-20130628122321

My top list would be:
 * 1) Ahri - steal youth, teleport and charm people
 * 2) Syndra - completely limitless telekenisis (she can even fly by pushing the ground away from her)
 * 3) Kayle - immortal, the ability to grant immortality and heal people
 * 4) Gangplank - recover from any sickness or injury
 * 5) Kassadin - tell people to shut up and teleport

Zilean does not make my list because his ability to see the future isn't worth being plagued with visions of my past.