Selling multiple REQ cards

We should be able to sell multiple REQ cards at once i.e. the mangoose. If possible, please tell me how.

Out of topic, I’ve also heard that we can buy REQ card by pressing ‘‘X’’ when opening a REQ pack?

You can buy req cards by hitting the ‘buy’ option on the req page. pressing x on a req card allows you to sell that card back for req points