I remember hearing something about a bitcoin credit card. Like, one that you pay for everything with fiat on credit, and then you pay off your bill in bitcoin. So you never have to hold fiat if you don't want to.
What's the best/most reliable credit card that does this?
I dont think there are bitcoin credit cards, just think about it, the name itself implies that you could receive credit for it, but do you think any bank is going to give you credit if they do not know who you are? So the only cards that exist are bitcoin debit cards.