Chaosmancer
Legend
It's more a playstyle necessary. An easy mode caster. A caster who mostly spams.
Then you use subclasses to match in lore specialization (warmages, stage magicians, logistics mages) or copying magic from other IP.
Just make a caster class that doesn't use any from of Vancian magic for offense and defense. The Warlock still relies of spell slots
I don't think it really IS a playstyle neccessity though. I've never been fully onboard that any class needs to be stripped down for new players. I disagree with the existence of the Champion, for instance.
And the way you would do this is so incredibly simple, that it is either ripe for abuse... or just making a class that is Eldritch Blast and as few abilities as humanly possible. Which sounds dreadful.