What is by far the hardest character to write that is actually quite common in Mandarin Chinese?

One of the characters often considered challenging to write in Mandarin Chinese is "biáng" (biáng). It's not as common in everyday language, but it gained fame due to the complexity of its strokes. The character is used in the name of a type of noodle dish called "biángbiáng noodles." Writing it involves many intricate strokes and is known for its complexity.