Sounds similar to Passivity of the Spell Casting Wizard. That was definetely in 3rd edition, possibly 4th.
I tried to do a 5th edition version of it for my house rules (3rd ed saga updated to 5th, needed a few spells)
the discussion is here
https://forum.atlas-games.com/t/house-rules-any-pitfalls-ive-missed/1038/1
I settled for Base 2, +1 Daimeter. Final level 3. Probably far too low for what it can do, but I couldn't think of any reason to make it much higher. Not that it mattered, lol. Saga currently on hold due to work, and no-one cast it 