What if Phoebe had become the most powerful Charmed one in season 4?

I despise Phoebe’s storylines after season three, so just for fun. The power of three dies when Prue gets killed by Shax and is reformed when Paige joins the Halliwell family. But what if the hierarchy of power gets mixed up and instead of Piper, Phoebe becomes the most powerful charmed one? What advanced powers and storylines would you give her? Revenge for Prue? Singlehandedly killing Shax?