Fighting: One of the original seven types in the Pokmon card game, Fighting represents Fighting, Rock and Ground-type Pokmon seen in the video games
Creating creatures that can go into combat is great, however, using them for Waterbending is mostly a secondary thing
The permanent with that ability will be counted if its still on the battlefield at that time
Its probably a coincidence that many of the main FFVII characters get the most busted cards from the set, whether from the Commander set or the Standard one
At the same time, the Hero deck required fewer lands, which meant that the Rat deck was more likely to get mana flooded (by virtue of needing to build with more lands in the deck)
This evens out the playing field, replacing large Voltron creatures or aristocratic life drainers with manageable small tokens instead