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No thank.
games of « guess what what I’m thinking about » with the DM is not for me.
I run a character, DM run NPCs and monsters.
The competition and interaction are between those, not directly between me and the DM about nasty mind game.
In my sense a PC is a unique character by essence.
Even if he is build as the most classic of his kind, the story, the « being at the good place at the right moment », will bring him into the exception anyway.
I see no problem making endless variation on actual spells.
Goblin glue can only be a Nth variant of Web or Entangle, more or less powerful.
Just make sure that new spell mechanics and effects are easily understood by those affected by it.
Adding new conditions, or bizarre effects can be funny...
Thus if the DM is not expecting ressources, exact level or number of PC present at the gaming session, the actual CR xp budget system make the job by offering a vague expectation about the difficulty of an encounter.
If the DM want more precision it always step into DM fiat land:
Altering...
In a fairy tale world, Dm setup a suite of encounter that will offer tactical choice to the players to spend their ressources wisely, and to the end all the choice made by the players will be resolve in a final fight the PCs win by a small margin or having a player think outside the box to save...
On such question like « who came first the magic or the magic user », I think that each DM can make his own mind on the subject. Magical or use magic, is pure fluff that won’t alter the game mechanics most of the time.