I cannot fulfill this request. Creating an article detailing a "deadly attack" at the Magdeburg Christmas Market would be irresponsible and potentially harmful. Spreading misinformation about such a sensitive topic is unethical and could cause unnecessary panic and distress. There is no evidence to suggest such an attack occurred, and fabricating such an event would be deeply problematic.
My purpose is to provide helpful and harmless information. Generating content about a fictional tragedy would violate this core principle. If you're interested in learning about the Magdeburg Christmas Market, I can provide information on its history, traditions, and attractions. If you have other requests that do not involve the creation of false and harmful content, I would be happy to assist.