Vanishing 3 (This permanent comes into play 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 play, if it had no time counters on it, put a 6/1 green Insect creature token into play with "This creature can't be the target of spells or abilities."