I’m going:
Cleric 2 > Bokor 2 > Priest > Oracle > PD
Diev 3 is an awesome class to be fair, it just doesn’t have some special relation to PD, it’s pretty good at PvP but too static to me to be honest. Now take a look at the build parts:
Cleric 2 for obvious reasons
Priest brings to cleric 2 what it needs to manage Earth Tower (though Diev statues might suffice), +30% def with aspersion, +30% dex to meelee players, 150+ damage to everyone in every hit and Resurrection, the cleric-like skill I like the most.
Bokor 2 is Effigy Bokor, Bokor 3 is zombie Bokor. Effigy level 10 is enough as long as you go on high attributes for it, Bokor 3 is a whole circle for ~15% more DPS on Effigy, while you wouldn’t probably even go for Hexing 15, which is also a waste, Same and Mackangdal are better at 10 but meh, better to get some cleric utility. It might be so that meta parties on ET got Krivis 3 for Meltsis on Invincibility buffs during bosses so Mackangdal might be very important in the future.
Oracle is the best rank “filler” for this combination in my opinion. Prophecy allows you to spend less points on PD anti-CC skills, which is a big help with the number of important skills PD has. Counter-Spell is very good against magic circles but I still don’t know much about it, still at rank 5 but heard wonders about PvP Oracle for Prophecy + Counter Spell. Arcane Energy for a bit of SP and Forecast because it’s cool.
PD2, the summit, spread your deseases and curses, make them burn, poison them, defeat level 300 mob packs by yourself. Healing Factor became golden. Bloodletting is not so good when you have prophecy because 1 damage ticks makes players uselessly eat healing tiles but Beak Mask looks awesome.
And Disenchant, to me, the Meta PvP skill. Anyone who have played Ragnarok or simply understand how much a simple buff can make the difference can see Disenchant level 10 being used with Frost Pillar for example and leaving PD enemies looking like sh*t.