Holy Hand Grenade of Antioch

Holy Hand Grenade of Antioch enters the battlefield with 3 time counters on it.
At the beginning of your upkeep, remove a time counter from Holy Hand Grenade of Antioch.
{t}: Destroy target creature. Activate this ability only if there are no time counters on Holy Hand Grenade of Antioch.
"First shalt thou pull thine holy pin..."