Ment
Auto-translated
That would be quite a niche application... In very rare cases (against hit-and-run tactics from the Dungeon faction), it could even be considered overpowered, as it virtually eliminates the opponent's entire strategy. But in all other cases, it simply doesn't work at all.
From a technical implementation standpoint, I'm not even sure if it can be done with scripts. And without scripts, it definitely can't work reliably in multiplayer. Unless it's combined with NCF? That is, replacing enemy units with invisibility with the same units but without invisibility. But it's still unclear what to do with spells.