DRM-Free (Steam version not withstanding)
Offline Multiplayer
PVP
COOP
5 different gameplay modes
4 Players simultaneously
3 vs 1 mode unique to this game
No real-money ingame payments
Based on these merits alone, its no exaggeration to say this is objectively the best card collecting game ever made, by a SIGNIFICANT margin!
People may have different preferences for other CCG gameplay styles , but no other digital card game comes even close to this feature set.
Please never stop developing this.