World Legacy Discovery (Rare) [MP18-EN073-R]

All "World Chalice" monsters on the field gain 300 ATK and DEF. Once per turn, if a face-up "World Chalice" monster you control is destroyed by battle, or leaves the field because of an opponent's card effect: You can target 1 "World Chalice" monster in your GY; Special Summon it in Defense Position.