The game is really not pay to win....and I saying this after playing for a month now...I have 3 heroes already at legendary....there are plenty of events  happening in the game for you to earn Limited Recruitment Cards, Advanced Recruitment Cards, and Normal Recruitment Cards...all you need a bit of planning and timing of the events to get these Cards absolutely free....I might have got even 100s of them from the events and ingame s like Terra Dome, Wasteland and Cinsaro Marsh...these will give you at minimum 3 to 5 Advanced Recruitment Cards everyday....and the Rise of Heroes and Ancient Altar will give you Limited Recruitment Cards every week man be patient and play your cards strategically and you'll end up with SSS Heroes currently I have 3 one of them almost legendary.

  Great graphics, good plot (rare one, where i did not skip dialogues).   Interesting fight system with huge variety of skills.   Yet hard donate oriented. Right now you get 620 crystals weekly, while 10 summons cost 2000. 3% chance to get hero (1.5% to get a targeted one, 200 points for pity).   BUT in this game effective heroes are only the ones with 5 copies got, cause skill deal ~ 60% more dmg and cost 2 mana ponts less (really huge boost, when you team get full 5+). 5* heroes get 20 more lvls than 4*.