The Work of Simplicius

Historic Permanents you control have Indestructible
Whenever a Philosopher you control would leave
the battlefield, you may have target Philosopher
or Scribe you control become a copy of it.
{g/w}{g/w}-Until end of turn, The Work of Simplicius becomes a 1/1 Green and White Legendary
Scribe creature named Simplicius, The Preserver