mutagen sorta.. erm, they're not really evoker types/conjurers, more like dr.jekyll types. I don't know of any way that they are actually shooting flames or summoning shadowy swarms of bats-
Though, if you went more with a Magus, and took the Myrmidiarch build, you could have a crossbow or repeating crossbow while letting loose some more flashy aggressive zoombah.
Or, take an Spellslinger if your gm allows for guns (escpecially if he allows for advanced guns. Sixshooter + evocation? Yeaaaaah baby. I saw one with a hand-bombard once. Sort of a one hit wonder, but MAN when he opened a fight, he wrecked shop.)