Vilgax, Kintargo's Vengeance

At the beginning of your upkeep, put a study
counter on target creature an opponent controls.
Whenever a creature dealt damage by Vilgax,
Kintargo's Vengeance this turn dies, if it had a
study counter on it, put a +1/+1 counter on
Vilgax and untap it.
{b}{g}, {t}: Vilgax deals damage equal to its power
to target creature.