I'm loving Spellblade and I love its class fantasy. I love the direction the rework took it for early access. Being Early access there is lots of room for improvement for all the classes, but I'm just going to talk about Spellblade.
My humble suggestions to make Spellbade even more interesting and fun.
All 3 infusions, remove the 25% mana reduction and instead give them a bonus to their pair spell.
Arcane Spear - remove the cast time, give it a cooldown, if used with Arcane Infusion gives you a small mana back buff, either instantly or maybe over time. Something small, maybe it gives you just the cost of Spear or a little more little less.
Kinetic Ward - This spell is already amazing, maybe even too good.. not sure how I'd change this but rather than 25% less mana some other interaction with Kinetic Infusion when you use it.
Discharge - remove the mana reduction from Electric Infusion, instead Discharge echo's for less damage while in Electric Infusion, maybe once or maybe as a small dot.
Lower the level of Gate to 30-40, give SPB a new Arcane Gate at 50, does not use your bindpoint, uses a special Arcane bond that the SPB can use at level 50 to bind this Arcane Gate to a very limited list of locations, could be just the Arcane Schools, could be a few spots in the world with big arcane energies, maybe just the largest of Wizard Portals, but still requires going to the location to bind, not a full blown wizard teleport that lets you choose whenever although I've heard others suggest just letting have SPB have a few wizard gates at 50+ which I would also be down for.
Self only Invis with maybe a short duration would be pretty cool and thematic.