There are only 40 Planeswalkers to begin with, so by ranking 10 it's quite a few. They are all really powerful despite being expensive and rare. There is even a two mana costed one. I was trying to come up with the worst one, but I really couldn't. There are some that are geared for specific decks - swarm, artifacts...etc. But being limited doesn't mean much because in those types of decks, these cards are game breaking. All that said, here are my ten favorite. Honorable Mention: There is always an honorable mention.This card is great, no question. Only costing three, she is definitely one of the most useful Planeswalkers. Her ultimate does some damage, her plus one hurts - but neither ability is truly game breaking. 10. Jace, Memory Adept Drawing an extra card every turn for five mana is a good deal by itself. But you add the extra mill every turn to prevent scrying and then the plus one becomes pretty neat. Milling for ten in a mill deck is a great deal. The ult...