Who is the Biggest Enemy of Lord Vishnu?

Who is the Biggest Enemy of Lord Vishnu?

Seeking insights and scholarly discussion on one of the most debated topics in Hindu mythology: Who is the biggest enemy of Lord Vishnu? While numerous demons and asuras have opposed Vishnu in his many avatars—such as Hiranyakashipu, Ravana, and Kamsa—opinions vary widely on who posed the greatest threat.

Is it Hiranyakashipu, the tyrant father slain by Narasimha? Or Ravana, the mighty demon king defeated by Rama? Could it be Kali (Kali Yuga's personification), who stands in opposition to dharma itself?

Open to responses based on scriptures like the Bhagavata Purana, Ramayana, Mahabharata, and other spiritual texts. Both devotional and academic perspectives are welcome.
Let's discuss: Who truly was Lord Vishnu's greatest adversary—and why?