I myself have 6 Credit Card and thinking of getting one for myself top. The Rupay Credit Card has the lowest fees, most comes under Rs 500. But the thing is AMC will be waived off if you use them say like Rs 50K in a year, which is quite achievable.

I have IDFC First Power, and I use for filling petrol. There are many you can choose from. Thinking of getting CSB from Jupiter too.