This will just be a build stub, as I don't have time whilst working on a client's post form to fully flesh it out, but a Hathran build should be able to trounce the TBoS with little issue, and also pwn a Heca in much the same way the Dwarven Colossus Archivist did (through a decent buff routine). It likely with that CL would blow away the 10^100 as well (as at least one Cleric build did, though this wouldn't have Marshall auras and be full 20/20 casting)
Human Cleric 5/Dweomerkeeper 4/Hathran 5/xxx Divine with nice abilities 6 (can be more than one class)
This gets us supernatural spell for +5 to all stats, circle magic, and with Earth Sense and Earth Spell, at least a +11 CL to each spell slot heightened to 20th. Mix in a few CL enhancers, cast GCF on an anthill, and voila - CL 100+ MDJ plus something to nuke the now gimped kitten with AC 12.
If we were to flesh this puppy out, it'd likely not qualify for the challenge (though to be fair, being a fellow Initiate wouldn't come into play - we don't need to be close enough for the AMF to matter, only high enough of a CL to cast into it), but getting a free metamagic on every spell and the entire Cleric list spontaneously is utterly bad ass.