>>96502465
Look, it's not as if I don't know where you are coming from, but what you want isn't realistic. The kind of wizard you want only ever existed in it's own narrativist structures, and it really begins looking like some people only read fantasy books and haven't played DND itself. The reality of how game design works is much harsher. 3.5 gave way to 4 and that gave way to 5. 5E being as close to 4E as it can while pretending to be 3.5 as to not piss off old men who'd rather shit where they eat than let things change. If we go back to 2E, you still really don't have an argument.
There's so much varied opposition in this thread against this precisely because people have actually played various editions, and the same issue crops up. Mechanically, the one spell a crisis dream doesn't work. Not in reality. Simply put, game balance won't allow it. You cannot be so important, or have abilities so powerful, that literally and I mean LITERALLY one spell is all you will ever need. There's other people there, and enemy design isn't so flat as to allow it either. The simple practical challenges and actual game structure don't support your version of DnD having ever existed.
..Unless you are that guy who clearly only plays at level 3 at most so SLEEP keeps being the only spell he ever needs. Which is also at a level where you have a single digit number of slots. Which.. you do you I guess?