I've played around with jungle Mord a bit.
Before the jungle changes it kinda worked. You could clear really quickly and safely, generally taking no damage from camps after your first clear. Rush the old AP jungle item and maybe counter jungle some as you can often out duel their jungler. Wasn't great tho as ganks are more or less non-existant.
Now? I gave it a try but in addition to your inability to gank (walking slowly into lane, aw ya) the new tougher camps don't just fall down before you like before so you can't even farm up quickly. It's certainly not a top tier choice but if your lanes are OK without ganks you can always come out in midgame hitting hard.
I could see the stalkers blade since the slow helps Mord kill things nicely.
Alternatively you might want to consider poachers knife and trying to out duel the enemy jungler. Lack of escapes make this one risky but if you have laners who can follow their lane well it could work as a sort of "reverse gank."
Draw the enemy laner into their jungle to fight you. Hit someone with your ult so you can 1v2 until your laner shows up. Kill the enemy in the ensuing 2v2. Profit.