Currently, the early- to mid-game Spellblade can nuke enemy units harder and with more flexibility than the Elementalist, whose entire theme is supposed to be nuking units harder than any other class. What's worse, it pops off right at the first skill point and just gets worse from there.
At first upgrade, the Spellblade gains access to their nuke skill, whereas the Elementalist gains an unimpressive attack modifier.
At second upgrade, Spellblade doubles the damage of their nuke skill, whereas Elementalist finally gains access to their base skill.
At this point, this is what the stats looks like:
Spellblade: 1 Action, Range 4, Cooldown 2, 24 - 27 damage
Elementalist: 3 Actions, Range 6, Cooldown 2, 20 damage
It isn't until the 5th skill point that the Elementalist even has a chance to catch up. The +50% evocation damage brings their nuke damage to... 30. An extra 3 to 6 damage at +2 range, in exchange for having to stay still in order to use it.
Elementalist either needs buffs to their evocations, or Spellblade needs a nerf to that Devastating Evocation upgrade.
EDIT: I was barely awake when I originally wrote this. Yeah, the Elementalist 100% needs a buff, rather than Spellblade needing a nerf.