Plague Of Azkaban

{t}{b}{2} Gives target creature taint (When taint is given to a creature that creatures +1/+1 counters become -1/-1 counters and the creature can not have any +1/+1 counters applied to it as long as it has taint)
{t}{b}{x}{x} Gives X creatures taint
"Hello friend. I'm here to save you good sir." Those were the last words King John II ever heard