According to the Mahabharat Shukracharya was not only the lord of wealth but he is also the master of the medicinal herbs, the mantras and all kinds of taste. His capabilities are wonderful. He had donated all his wealth to the demons and had accepted the life of a hermit. By the inspiration of lord Brahma he became a planet and started to protect the lives of all the living beings of all the three worlds. In his form of a planet he attends the assembly of lord Brahma.
When Venus is malefic, the use of Venus yantra/Shukra yantra is very benefic and favourable. Shukra yantra is kept on rising Moon Friday. Venus Yantra bestows respect and peace of mind.