The efficacy of a black four-leaf clover includes symbolizing protection from disputes, luck, and good fortune.

Symbol of Luck and Good Fortune: The four-leaf clover is inherently a symbol of luck, and the uniqueness of the black color may signify deeper levels of luck and good fortune.

Protection from Disputes: It is believed that the four-leaf clover has protective properties against negativity and disputes, hence preventing conflicts and negative energies.

Boosts Confidence: Carrying a lucky symbol can boost confidence and a positive mindset, helping attract more opportunities for luck and good fortune.

Attraction of Happiness: The four-leaf clover symbolizes happiness and goodness, aiding in attracting and maintaining a happy state.

In summary, the black four-leaf clover serves as a lucky charm that not only symbolizes luck and good fortune but also offers protection from negative influences and enhances a positive mindset.