Ideas and suggestions.

Please provide a detailed description of the mechanics, including numbers and how it depends on the skill level.

I'm not very good at the game, so my numbers might be way off.

For MP regeneration (level 5), I think it would be better to give a fixed number instead of a percentage, so that the regeneration doesn't depend on logistics. The numbers could be:
* +250 without the Water skill
* +500 basic Water
* +750 advanced
* +1000 expert
The mana cost is similar to other control spells - 20 mana without the skill.

For creature teleportation (level 3), also give a fixed amount in hit points:
* 350 without the Fire skill
* 700 basic
* 1050 advanced
* 1400 expert
Make the mana cost lower so that weaker players can use it a couple of times without needing to regenerate - 12 mana.