"Lemuria" may also be used in a "Nimble" Deck that focuses on the WATER "Nimble" monsters, as you can Summon 3 of them with little effort. Activate "Lemuria" and all 3 Level 2 monsters will become Level 5, then you can overlay two of those for "Abyss Splash".
"Wind-Up Shark" with another copy of itself may be able to Xyz Summon this card quickly.
Because this card's effect is doubling the current ATK of this monster, you could use its effect during your turn and then again during your opponent's turn. While using up its materials, it will also have an ATK of 9600 until the end of that turn.
An easy way to Summon this card is to play "Beautunaful Princess", activate its effect, banishing it for "Saber Shark", afterwards, Special Summon "Silent Angler". Use "Saber Shark" to boost the Levels of itself and "Silent Angler" to 5.
You can Xyz Summon this card by first using the effect of "Instant Fusion" to Fusion Summon "Sea Monster of Theseus", and then Tributing it to Tribute Summon "Salvage Warrior". Use the effect of "Salvage Warrior" to Special Summon "Sea Monster of Theseus" from your Graveyard, and then overlay the two monsters to Xyz Summon this card.