Xeshii, Corrupt Paladin

Flying, First Strike, Deathtouch
{t}{w}{u}{b}{r}: Target creature gets an emblem that says "When this creature dies, put a +1/+1 counter on Xeshii, Corrupt Paladin"
"Xeshii is only one of the angels who were suddenly driven mad and hunted those they previously sworn to protect"
-Odis, Elemancer