Servus, Draco Construct

Flying
If this is the second time you've cast Servus,
Draco Construct, it perpetually gains vigilance.
If it is the third time, it perpetually gains
trample. If it the fourth time, it perpetually gains indestructible.
Servus, Draco Construct's power and toughness
are each equal to the amount of mana spent to
cast it.