For a highly dynamic application, what strategy should be used in selecting test cases for automation?

In the context of a highly dynamic application, it's recommended to implement a risk-based approach in selecting test cases for automation. This involves identifying and prioritizing test cases based on the areas of the application that are most critical or prone to frequent changes. By focusing on high-risk areas, automation efforts can be targeted effectively, ensuring that the most important aspects of the application are covered, and the automation suite remains maintainable in the face of dynamic changes.