This card can be useful in an "Ice Barrier" Deck, as "Prior of the Ice Barrier" is a Level 2 Aqua and almost all "Ice Barrier" Tuner monsters fall into the category that this card targets, as well as a few other monsters that support the archetype.
Similarly, since most Fish, Sea Serpent and Aqua-type monsters are WATER-attribute, Special Summon "Deepsea Macrotrema" and forcefully trigger its effect (with cards like "Spiritual Water Art - Aoi") to strengthen the rest of your monsters.
Use this card in a Fish Deck to revive most monsters in the deck:
Revive "Swap Frog" as a Level 2 non-Tuner and mill "Treeborn Frog" or "Ronintoadin". You can then bounce "Swap Frog" to your hand or Tribute it for a Tribute Summon.
Revive "Oyster Meister" for a Level 3 non-Tuner that leaves a Level 1 Token when it's used to Synchro Summon.
This card is useful to summon an Xyz Monster like "Black Ray Lancer". However, note that not all Fish, Sea Serpent, or Aqua-type monsters are WATER monsters, so they cannot fulfill the requirements to Summon "Black Ray Lancer".