This reminded me that one thing I miss from WPF is the "free" render-time polymorphism.

If you had an interface, say ICard, and a few xaml data templates for how to render the concrete types, all you had to do was bind to a collection of ICards and it would automatically do what I guess we'd now call pattern matching on the concrete type of each element to render it without needing to mix the presentation with the plain old c# objects.