Brian, the Exiled One

+2: Create a 2/2 Prisoner with exert tapped. When you exert a prisoner, that exerted prisoner gains a +1/+1 counter.
-4: Exile target permanent. Permanents exiled this way remain exiled until this planeswalker leaves the battlefield.
-12: Until end of turn, all creatures you control gain infect. Gain an emblem that has, "Pay 6 life: Return Brian, the Exiled One to your hand."