Which of these Magic the Gathering cards are the best?

The Phyrexian Crusader is the money card in your list and also sees play in tournaments. While Mortarpod is not an expensive card it also sees play in tournaments. Mortarpod is somewhat of a counterintuitive card in that it doesn't seem that great but once you figure out how to use it it begins to make sense. Those are probably the two best cards on your list.