Epic Cards Battle

I was looking through old update logs and I noticed that there was a feature introduced back in 1.9 or 3.0 that said if you don't buy diamonds for a month you will get a 50% bonus on the diamonds you buy.

Is this feature still around? I asked some players and they said that it was but the time was reduced to two weeks. Also, if it is still a feature will the 50% bonus affect the bonus diamonds given to you (like 1200 diamonds becomes 1800)?

Yes the feature still around and i think it refreshed itself every month. And the bonus is calculated like this, for example if u buy 1000 diamonds they will give u 2200 diamonds ( becos u purchase 1000 diamonds and for that they give u 1200 non bonus and 1000 diamonds bonus)