Deadtime Watch

Deadtime Watch enters the battlefield tapped.
Deadtime Watch doesn't untap
during your untap step.
If you would begin your turn while Deadtime Watch is tapped, you may skip that turn instead.
If you do, untap Deadtime Watch.
{t}: Take an extra turn after this one.
This unique watch stops time... for a time. Unlike death, time moves on. Those who stood still with time move on also... unless they're dead.
- Cheshire Cat