Interesting Morde buff idea
Since you're currently looking at
due to DFG removal, I had an interesting and thematic idea to give him a bit of a nudge. Instead of just his spells and ult ghost generating shield, make it so ALL damage he deals generates it. Basic attacks,
,
,
, all of it. It would give him quite a few more itemization options and fit his theme quite well without pushing him over the top.