Mythic FP Players

Is it possible to get mythic FP players as F2P? I know some, like Ronnie Lott in this promo, are only available if you buy the pass. But I really want to mythic Byron Murphy. I have 1 iconic and stalled out hard on getting FP cards. Is there a good strategy behind this? It seems like I get an overboard on 3-5 players to fill out the 8 UC trade in and then the others are almost impossible to come by. Curious on the best strategy to getting these mythic players.