Katsuo, Starchild Renegade

Vigilance
Katsuo, Starchild Renegade enters the battlefield
with 3 Ki counters.
When Katsuo enters the battlefield or attacks,
it deals damage equal its Ki counters to target opponent.
{t}, remove any number of Ki counters from this
card: put -1/-1 counters on that many target
creatures an opponent controls.
Tap those creatures. They do not untap at their
controller's next untap step.