Luigi, Heroic Understudy

Luigi, Heroic Understudy gets +1/+1 for each legendary creature you control.
Luigi, Heroic Understudy gets -1/-0 for each legendary creature opponents control.
Auras and Equipment attached to Luigi, Heroic Understudy have Super Armor. (If enchanted/equipped creature would be destroyed,
instead remove all damage and destroy all Auras/Equipments on it.)