SCP 4975 Time's Up

Vigilance, Shroud
SCP 4975 doesn't untap during your untap step.
{t}: Roll a d4. Put that many time time counters
on target creature. It gains vanishing.
Whenever the last time counter is removed from
a creature, untap SCP 4975.
As ticks the time, so ticks your heart. May you live
long as you hear its song. Did you hear it? Did it stop?
My child, it meant your time was up.