What if “magic” was defined as only momentary violations of the laws of physics?
So one of the things that define D&D magic is things like enchantment of items, the “continual light” spell, and so on; things that persist. What if the world only allowed only momentary violation of physics, causality, whatever?
It seems like a small change on the surface, but it’s probably huge: it’s a world without “magic” swords, or whatever. Most fantasy game worlds are built on persistent magic.