I have not seen any card with a flat discount other than some Indus super HNI cards with huge fees.
I am trying to get an Insignia card with no joining or annual fee, and that too without maintaining a huge RV with them. I do hold a Signature banking account with RBL with a good enough RV and investment account.
The thing is that RBL has just started sourcing cards from their banking platform, earlier it was completely outsourced. Still, things are not very well defined and may need a little push. that's what I am trying to do.
RBL Play is a good card, but the discount is linked with the spend which doesn't make any sense. but the rest is fine.