Current draft of my ranking of WHF's magic-users. As before, I welcome insight and feedback.

The Top 10

1. LORD KROAK (Lizardmen)

2. LORD MAZDAMUNDI (Lizardmen)

Other eight:

• Alarielle the Radiant when not jobbing (High Elves)
• Caledor Dragontamer (High Elves)
• Gregor Martak when amped by Teclis (Empire of Man)
• Kairos Fateweaver (Tzeentch)
• Lord Adohi-Tehga (Lizardmen)
• Lord Huinitenuchli (Lizardmen)
• Nagash the Undying (Independent)
• Teclis (High Elves)

11-25

• Ariel (Wood Elves)
• Be'lakor the First-Damned (Chaos Undivided)
• Constant Drachenfels (Vampire Counts)
• Egrimm van Horstmann (Tzeentch)
• Galrauch (Tzeentch)
• Khatep (Tomb Kings)
• Lord Tenuchli (Lizardmen)
• Malekith the Witch-King (Dark Elves)
• Maximillian "Max" Schreiber (Empire of Man)
• Morathi (Dark Elves)
• Morgiana le Fay Enchantress (Bretonnia)
• Nagash during his war with Sigmar (Independent)
• Tetto'eko (Lizardmen)
• The Changeling (Tzeentch)
• The Dread King (Vampire Counts)

26-50

• Adanhu (Wood Elves)
• Arkhan the Black (Tomb Kings)
• Belannaer the Wise (High Elves)
• Coeddil (Indeoendent)
• Drycha the Briarmaven of Woe (Independent)
• Durthu (Wood Elves)
• Elontir (High Elves)
• Heinrech Kemmler (Vampire Counts)
• Helspeth Bale (Tzeentch)
• Human Nagash (Independent)
• Karitamen (Tomb Kings)
• Kritislik (Skaven)
• Lord Skrolk (Skaven)
• Mannfred von Carstein (Vampire Counts)
• Melkhior the Ancient (Vampire Counts)
• Nebmakhet (Tomb Kings)
• Skreech Verminking (Skaven)
• Thanquol when not jobbing (Skaven)
• The Hand of Nagash (Vampire Counts)
• Thorek Ironbrow with his anvil (Dwarfs)
• Tzarina Katarin Bokha the Ice Queen (Kislev)
• Vermalanx the Corrupt (Skaven)
• Volans (Empire of Man)
• W'Soran the Wicked (Vampire Counts)
• Zacharias the Everliving (Vampire Counts)

51-75

• Anara of Garamont (Bretonnia)
• Astragoth Ironhand (Chaos Dwarfs)
• Aurelion (High Elves)
• Azhag the Slaughterer (Greenskins)
• Balthasar Gelt (Empire of Man)
• Bloab Rotspawned, Lord of the Daemonflies (Nurgle)
• Christoph Engel (Empire of Man)
• Dieter Helsnicht, Doom Lord of the Undead (Vampire Counts)
• Drazhoath the Ashen (Chaos Dwarfs)
• Elspeth von Draken (Empire of Man)
• Finreir (High Elves)
• Frederick van Hal (Empire of Man)
• Ikit Claw (Skaven)
• Khenteka (Tomb Kings)
• Malagor the Dark Omen (Beastmen)
• N'Kari the Arch-Tempeter (Slaanesh)
• Neferata (Vampire Counts)
• Savan of Tiranoc (High Elves)
• Tchar'zanek (Tzeentch)
• Thanquol when jobbing (Skaven)
• Thyrus Gormann (Empire of Man)
• Verspasian Kant (Empire of Man)
• Vilitch the Curseling (Tzeentch)
• Vlad von Carstein (Vampire Counts)
• Wurrzag da Great Green Prophet (Greenskins)

76-100

• Anarelle (High Elves)
• Burblespue Halescourge (Nurgle)
• Eleanor de Quenelles (Bretonnia)
• Festus the Leechlord (Nurgle)
• Gregor Martak (Empire of Man)
• Hapusneb, Master of the Swarm (Tomb Kings)
• Isabella von Carstein (Vampire Counts)
• Lady Iselda of Acquitaine (Bretonnia)
• Lilaeth (Dark Elves)
• Lord Blistrox (Skaven)
• Lord Grilok (Skaven)
• Lord Gritch (Skaven)
• Loremaster Shrinastor (High Elves)
• Melekh the Changer (Tzeentch)
• Molokh Slugtongue (Beastmen)
• Moonclaw (Beastmen)
• Nebamun (Tomb Kings)
• Princess Adranna (High Elves)
• Rasknitt (Skaven)
• Sienna Fuegonasus (Empire of Man)
• Sister of Thorn Keriilian (Wood Elves)
• Skittar (Skaven)
• The Harbinger (Beastmen)
• The Three Sisters of Ancelioux (Bretonnia)
• The White Ladies (Vampire Counts)

Too Undefined / Vague / Inconsistent to rank:

• Aekold Helbrass (Tzeentch)-Only really tested against specific foes. Otherwise featless.
• Amonkhaf (Tomb Kings)
• Anethra Helbane (Dark Elves)
• Astarielle (High Elves)
• Brak Batwing (Greenskins)
• Elynesse of Charnorte (Bretonnia)
• Grabnatz Sourbelly (Greenskins)
• Kerrinath (High Elves turned Dark Elves)
• Naieth the Prophetess (Wood Elves)-Her whole shtick is prophecy/foresight. Doesn't use her magic for combat.
• Nicolete of Oisement (Bretonnia turned Vampire Counts)
• Tchzen of the Silver Claw (Tzeentch)
• The Blue Scribes (Tzeentch)-They pick spells totally at random. If they didn't do this, they would be Top 25.
• Yrtle (High Elves)-We know he's held in high esteem and that he died fighting Chaos, but not enough context for his death or concrete feats.