Please create an oil painting of a male wizard in a medieval style. The wizard is dressed in a long robe adorned with intricate patterns and symbols. He has a long white beard, piercing eyes, and holds a staff with a glowing crystal at the top. The surroundings include a dark, mystical forest with ancient trees and a faint mist, adding to the mysterious atmosphere. In the background, there is a small stone altar with candles and spellbooks. The overall atmosphere is filled with mystery and magic, with rich, dark colors, evoking a sense of ancient wisdom.