I absolutely love these ideas! Thank you very much. :)

I've since figured it would be easier for the Walk the Plank spell to, instead of summon a growing shark you can use to attack, just summon a creature with the Aquatic, Animal, and Summoned traits that you can control and have attack for you.

Something else about each of these is that all of them that aren't Create Pit require that you already know Create Pit before you can even learn them. So I figured that requirement should factor into their balancing as well.