das/dass sheet

das/dass sheet enters the battlefield with 5 time counters on it. At the beginning of your upkeep
remove one time counter from das/dass sheet.
Then if there are no more time counters on it sacrifice it.
Creatures your opponents control can't attack
while das/dass sheet is on the battlefield.
"I'm sorry General, but I can't join the forces
until i finished my das/dass sheet."