Does Humility override already-existing effects that modify creatures power and toughness, like Giant Growth?
Humility is applied after all preceding effects, so would override all of those effects. For example, if Humility comes into play when a creature with Armor of Thorns on it is around, that creature is 1/1, not 3/3. But if Giant Growth resolved later, that creature would be 4/4, not 1/1. And so on.
