YES!!!!!
Wave 4 is neither Epic or on the ban list, thus they are legal.
If you did not acquire them while others did it is your failure to prepare. Is that not much the same attitude I read in a certain locked thread? Ironic how some claim one thing is within the rules while another that certainly is within the rules is rallied against.
You don't have wave 4 and I do, that will help me win, so it must be good. Right?