for those saying "not f2p friendly", please, you guys just suck at games lol im using 1 5stars character, and the rest is full 4stars, not even spend a dime lol
free character is pretty much good, also try to learn how to choose card better and build it according to your team build, game is like roguelite, its not just how high your character tier, but also how you strategize. cards, positioning, skills, everything counts.
can do pretty much everything without spending money, so imo its f2p friendly. very.