Sophia, Font of Wisdom

Flying Lifelink Vigilance
Cards in your hand, battlefield, and graveyard cannot have their color changed by your opponent. Cards that are both and only Green and White cannot have their casting or effects negated.
{g/w}{g/w}: When a non-black creature card on your side
of the field is regenerated you can activate this ability. The regenerated card gains indestructible until this card leaves the field.