plague doctor

{10}{w/b} exile all of your target enemies placed creatures exile plague doctor
tribute 4 (pick one enemy plyr. to give your plague doctor 4 1+! counters on it
if tribute is not payed you get 5 life
{5}{t} make target enemy take the top 10 cards off the top of his/her library and exile them
{1}{b}{t} make 2 1/1 rat tokens with hexproof
{w/b}add 4 +1/+1 counters on any creature and send plague doctor to your graveyard