I just thought of a faster way to clear the entire deck of its cards instead of having to click every card out. There would be some sort of icon on the deck screen that has an icon that says "Clear All Deck" then a notification asks if you are sure if you want to clear your entire deck.
If you click yes then the deck will completely wipe and you can rebuild it.
We honestly need something like this sometimes I think I am going to break my mouse lol, not that I don't click it enough but yea this is a good idea I don't know why they didn't already have this implemented.
I have to agree with Seethe on this one. Carry a couple of decks for special occasions. Carry a blank one so you can fill it up accordingly when you have a need.