What myths should I aim for?

I got back into the game a couple months ago for zayne's thrid myth and I have been catching up. I used to be free to play but now I have the auram pass and I am willing to spend a bit (Don't ask me how much I spent of rafayel's solo). I want to minimize sending but I also want myth card but I am not sure what myth's I should be saving for.

I am an OG3 girlie with a preference to Rafayel. Since I got Zayne's third myth he is lower on the priority list. I have the orignal myths for all three but I am finding it difficult working with Xavier's myth in combat so one of Xavier's myth is the most important one, then Rafayel, then Zayne. Where my problem is I'm not sure if I should save for a myth rerun on save for the fourth myth. I think the fourth myths are really far away, so that might be too severe. But i heard there is no guarantee to get both myth cards with reruns. I also have one of the cards for both Rafayel and Zayne's 2nd myth. I hope I explained it well enough but I am also worried about how close myth reruns would be to eachother.