Never ever ever ever ever ever ever ever ever ever ever ever ever buy tokens. Of any kind.
Horde your ISO. Just because you have a lot now doesn’t mean you won’t wish you hadn’t leveled Beast just because he was your most covered 3 star. You’ll need all the ISO you can get once you get covers for characters that actually matter.
EDIT:
Also, I never knew the red tiles were from people attacking me. It always mystified me what these red tiles were that didn’t cost a skip tax to skip. Then one day, after months of playing, I noticed the pop up and the retal tile had the same name on them.
Not until then did it click.
And not until then did I realize that attacking people worth less than 25 points meant that I would be a fat juicy target for them in retal.
And I know a lot of people don’t know this because I’ve gotten in many fights where I’ll attack someone for 35, they’ll retaliate for 15. Then I’ll attack for 35 again. Then they’ll retaliate for 20. Then I’ll attack again for 30.
They never realized that my attacks were not a coincidence and that they were actually causing themselves to lose points by retaliating every single time.