Use this tip to unlock the following bonuses:
Extra Endurance for Harry: complete the "Quidittch" card set or complete the "Wizards" card set
Extra Endurance for Ron: complete the "Dragons" card set or complete the "Classical Beasts" card set
Extra Endurance for Hermione: complete the "Witches" card set or complete the "Hags" card set
20 House Points: complete the "Beasts", the "Giants", the "Vampires", the "Goblins" card sets