The elemental sinergies are kinda of gimmicky though. Cast a storm to generate a water puddle and cast lightining on it to electrify it and stun enemies could be easily achieved with a spell the stun enemies right away.
If the system is deep enough, you can do more cool things.
Cast a storm to create water on the ground.
+ fireball = creates steam which limits visibility, or burn damage.
Or + ice = makes the ground slippery to make the enemies fall, losing a round.
or +electricity = to stun enemes with electric charge.
And all of these are AoE speels, while a single stun spell could probably just target one enemy. Might be gimmicky, but a cool gimmick.