Ayakashi: Ghost Guild is a free to play card game where you take the role of an Agent that does multiple missions and deal with other ghosts/spirits with your ghosts/spirits. Anyway, I have been playing the game for quite a while now and I'll confirm that it's definitely pay real money for good rare cards most of the time (or you could say pay to win). There is actual no chance to get a good rare card without paying a cent unless you do a lot of grinding for certain events. That also means you won't have much of a chance in PvP. However, Story mode and some certain events is actually not that bad along with artwork for the cards. It kinda reminds me of a visual novel. Overall, a somewhat terrible card game but with nice artwork (and it's runned by Zynga after all).
Conclusion: Somewhat terrible card game but with nice anime artwork.
Note: Available in the US and Japanese app stores.