Sarial, The Black Queen

+2: Up to one target creature gains +2/+0 and infect until end of turn
-4: Proliferate, if this ability was used to put a +1/+1 counter on a permanent all counters on that permanent are -1/-1
-10: You get an emblem with: Creatures you control have Infect and trample, at the end of your combat phase, proliferate