Min Yum has been illustrating Magic cards for Wizards of the Coast since the New Phyrexia set, for which he illustrated Chancellor of the Annex, Lost Leonin, "Melira, Sylvok Outcast," and Shrine of Limitless Power.
All of the Magic: the Gathering cards Min has illustrated can be viewed here: http://gatherer.wizards.com/Pages/Search/Default.aspx?action=advanced&special=true&artist=+[%22Min%20Yum%22] Note that the gatherer database does not usually show promotional cards. The gatherer can also experience difficulties with links like this. If you are taken to an error page, click on "advanced search" at the top of the screen. Once on the advanced search page, scroll down to the artist search bar, input "Min Yum", then click "Add," and go back to the top of the page to click "Search." You should arrive at the page linked above.