Only best MVPs are camped - like Ifrit and Gloom, most of them are very easy to get -try to get Stormy Knight, Pharaoh or many others. So it is quite easy to get some times if you are patient enough. Many of them are always there, no one even bothers to kill them.
Maybe in last month there is slighter bigger price, because not many people now hunt MVPs. But card prices generally go down in like few months period.
As for lists e.g. - cards: Ifrit, TG, TGK, GTB, Gloom, Kiel, FBH and others. loots: Drake-BoF, Eddga - Bear Sinew, BR - BoG and others. But like Pharaoh or SK does have nothing interesting.
MVP Lootbox is a box you get for killing scheduled MVP that appears in for_filds - there is announcments for them. They drop different things - from tokens to int/str/dex/.. books