by Steelhorns
Now I've got an answere from a moderator of the mage wars forum on their homepage:The passage "you can't make an attack" referrs to the walkthrough, and at that special part of the walkthrough, it should stress that you cannot do any quick actions like performing a quick attack or make a move.
You CAN use any available quick spell in your Quickcast Action, though!!! So, you can cast an attack spell as long it is a quick spell and available to you. It may be bound to your Elemental Wand, it may be the Arcane Zap or be prepared during the Planning Phase.