Erasmus, Student of Erasmus

If a card named Erasmus, Student of Erasmus
has left the battlefield once during this game,
Erasmus, Student of Erasmus gains hexproof.
If it has left twice, Erasmus, Student of Erasmus
gains double strike. If it has left three times,
Erasmus, Student of Erasmus gains flying.
There is no foe more dangerous than one who learns
from every defeat.