Vanishing 3 (This permanent enters the battlefield with three time counters on it. At the beginning of your upkeep, remove a time counter from it. When the last is removed, sacrifice it.)
When Deadly Grub is put into a graveyard from the battlefield, if it had no time counters on it, put a 6/1 green Insect creature token with shroud onto the battlefield. (It can't be the target of spells or abilities.)