AD Malz is a more compelling Summoner champ than Yorick
Yorick feels more like an obnoxious AD caster thing that happens to conjure critters with his spells. None of the spells do a particularly good job of supporting said minions, nor are they the bulk of his damage.
Most of AD Malz' damage comes from his crabs. His spells are great for supporting them. Q silences foes so they can't escape a good snippin'. E tells the crabs who to snip. W provides zone control. And of course R holds a target down for an epic snippin'.
It seems to me Riot should embrace AD Malz (the most unique ADC in the game) and give him some support so he can work on maps other than Dominion. Make his auto-attacks provide half a charge (a third, maybe?) and hard-cap Malz at two crabs. Because if you play your cards right, you can get three crabs out at a time.
Ever see what happens to someone with three crabs snippin' at them?
It ain't pretty.

. Also, make those ghouls last long enough to do their jobs instead of auto attacking twice and then timing out.
good on AD Malzahar?
As in, do his voidlings proc the passive?
, and very useful for an AD caster build on Ezreal).
or
to solve his mana issues. Muramana helps more early on and at end-game lets you spam a ton but Essence Reaver gives you CDR and enhances your autos by rewarding you for it with mana to attack your enemies. If you do get Essence Reaver though, you will need
unless you decided that
would be a better investment early on (Hint: it is totally a worthwhile investment if you can get it without delaying your build too much)