I was initially concerned about DD ability with a low might Arcane Knight blood mage. I have been playing that Nerd Commando build on PotD with a might of 7(3 + 1 human + 2 BB + 1 GOTM) and now at lvl 16 he has remained the parties highest damage dealer by a fair margin. 7 might is only -9% damage but that let's you max dex, int, and per. With unlimited casting ability I suspect that dex is the better stat damage wise and the int certainly helps as well for all the damage dealing spells with duration(Corrosive Siphon is a go-to for my bloodmage). A typical fight will go like this: Self buff with Infuse w/Vital Essense + Deleterious Alacrity (in stealth as frontline is forming)
Get 2 slickens out and expose vulnerabilities
Cast a shadowflame (damage + CC, love it) Often at this point I will primarily be blasting out shadowflames for both damage and to keep enemies in perma lockdown. I think this is where having the low might/passive healing/voidward really shines. Since I don't know what spell lvl will be replenished with blood sacrifice with this build I can do it 3-4 times in a row no problem. This way I'm guaranteed to get that particular spell back quickly while still being able to layer in some additional debuffs, CC, maybe a corrosive siphon.
I have only really played the BM in this way so perhaps I could do the same w/o the combination of low might/stacked passive healing/voidward but what I can say is this build has felt very powerful both from a DD and a CC/debuff perspective.