technically, they are allowing 2 cards. One this and other the Rupay card. So, maybe i guess. Others can help better i think here.
I will try to apply for second core card around march.
I am aware 5% off on utility bills in Amazon pay (not always). 5X on insurance payments and it hardly gives you around 1%. There are several entry level cards that gives 1% as base rewards. So no use of holding this card