Vanishing 3 (This creature 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 Chronozoa dies, if it had no time counters on it, create two tokens that are copies of it.
2/1/2007 The ability checks to see if Chronozoa had no time counters on it at the time it was put into a graveyard from the battlefield. This doesn’t necessarily mean it must have been sacrificed due to vanishing; it could have been put into the graveyard some other way (say, while the sacrifice ability of vanishing is on the stack).
2/1/2007 Chronozoa’s last ability creates two Chronozoa tokens that each enter the battlefield with three time counters and have all of Chronozoa’s abilities.
2/1/2007 If Chronozoa becomes a copy of another creature and is put into the graveyard from the battlefield, no copies will be created. If another creature becomes a copy of Chronozoa and is put into a graveyard from the battlefield (with no time counters on it), two copies of Chronozoa will be created.