Vin, Selfless Steward

0: Until you next turn, if you control another planeswalker, Vin gains shroud. Put a loyalty counter on target planeswalker. You gain 1 life.
-3: You get an emblem with "White creatures you control get +1/+1 and have vigilance."
-7: Destroy all nonwhite creatures. Then sacrifice Vin, Selfless Steward.