Raven, Starnheim Rider

+1: Create a 1/1 Black Bird Creature token with Flying and Lifelink.
-1: Gain life equal to the number of planeswalkers you control, then if you gained more than 3 life this way draw a card.
: Partner with Bjorn, Raven's Chariot. Raven, Starnheim Rider can be your commander.