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This is a rather interesting skill, but in my opinion, it is less effective than the ones mentioned above. Knowing all the spells is good, but a mage still won't be able to use them all in battle, and they can learn the most necessary ones anyway. Perhaps it could be useful to find something suitable against any opponent. Overall, the main advantage is that it allows you to vary the spells you use, depending on the specific situation in the battle, but this skill pales in comparison to most other absolute skills.
In fact, omniscience has another advantage: it saves space for at least one skill. Although this will only become apparent in a long game and only if you really need various machines with catapults, which is not necessarily the case... Yes, it's not very useful in multiplayer, but in general, special abilities are not very useful in multiplayer anyway. However, for single-player, this skill is very, very useful, in my opinion.