>>96516010
The broken build I came up with is you combine the Blue Mage, Puppeteer and Battlemaster's Link spell.
The Link spell turns everyone who casts it into a Hivemind. With Puppeteer you can just create a puppet, have it cast Link and then you no longer have a range limit and can just stay home while your puppets do the work.

Blue Mage + Spooky Action allows anything any puppet kills to strengthen every puppet in your army and there's no reason puppets can't create puppets. So you'd just expand and expand without end.
For a bonus the Blue Mage ultimate that gives you shapeshifting also lets you turn flesh into mana. So your army could fuel itself on the corpses of it's enemies.