The Boy Who Shattered Time

When you cast an instant or sorcery, you may put a Chrono counter on target creature an opponent
controls. When The Boy Who Shattered Time deals damage to a creature with a Chrono counter on it, it becomes tapped with a number of Stun counters
equal to the number of Chrono counters it had.

Time Dash — {5}: The Boy Who Shattered Time
deals damage equal to its power to target creature
you don't control.