Lord Windgrace. Who says he needs to be in a lands deck? His +2 is just simply great, turning dead draws into live ones. Getting to tormenting voice every turn for 0 mana is just good. I also use him to pitch spells for mizzix mastery, flashback and so on. His -3 ramps extremely well too. His ult also is very good and relevant for the deck. Moreover, as a Planeswalker he doesn't die to the weather that the deck runs.