Pretty sure Tsidkenu used it with Aieli and said it worked, but don't want to put words in his mouth... I haven't heard any reports that it doesn't work either. Also, you don't need to use Avasculate... Maximized IGMS will do 144 points of damage, Empowered will do 84. Or you could use Maximized Fireburst (168), Chain Lightning (144), Disintegrate (240) or any number of other damage based spells. That said Divination is certainly still an "RP" choice rather than a power choice, but Tsid is really the 'expert' on such things (and really on just about anything related to magic).
My point was simply that one does not have to rely on Necromancy to be a strong caster as even the 'weakest' school has spells that are 'good enough' to warrant a look. That said Evocation has the bigby line of spells in addition to most damage spells, Conjuration gets improved summons, cloud spells and some damage spells, Transmutation gets polymorph, shapechange, and a couple save spells/damage spells, Abjuration gets dispelling and protections (though I forget if we made them better at doing either)... There are many incorrect assumptions that IMO proliferate Necromancy as 'they' school to specialize in, but a general belief doesn't actually make something in to a fact. I would argue Conjuration and Enchantment are the two BEST schools if you want to be able to make it through DM events, since they can make their spells take out many enemies through summons/domination, while DC Casters spend at least one spell for every encounter, the Conjurer or Enchanter may only need one spell for several encounters. Thus leaving them with a larger arsenal for the end boss.
Arguing the power of a mage based on one spell that they might be able to cast 4-6 times in a rest doesn't really take in to account all of the facets that go in to a 'power' discussion. There are lots of different ways to be a successful mage, that's why they are an interesting and popular class! I have never focused on Necromancy mostly because I find it the least interesting, personally. I have played a DC illusionist (HiPS mage), a Conjuration/Crafting focused Mage (M/MA/T- Current) and several gish types and have never found any of them in need of more power or more options... Any my HiPS mage opposition school was Evocation so no Bigby and no IGMS! He still did great (Quickened Grease + pick your save or X spell FTW!) Buddy of mine, Invoker helped me realize that little combo and I once took out Chaos and his buddies using it. Laid down a couple of grease spells, followed by an Acid Cloud and a couple Undeath to Deaths... Good fun!
