Obsidian card by Crypto company in colaboraton with Visa is their highest card with almost all possible advantages (Netlix, Spotify, Amazon Prime free, AirBnb, Expedia discounts, airport lounge with guests). You can use card as you are used to but you can not pay with crypto directly nor there is any automatic crypto exchnage feature implemented. You will need to hold fiat deposits in order to pay with card. The FX are quite good and cashback of 8 % will definitely cover this. It seems that the card is almost perfect but you need to stake 1 milion of native currency which is something similar to 100k USD and from November it will be 2,5 mil. native currency (250 k USD). This meens that the card is only for VIP milioners. In my opinion you should choose differentc card tier or different company.