First of two, Summon this card and Special Summon "Shark Stickers" from the hand via its own effect. Use "Transmodify" on "Stickers" to bring out any WATERFish-Type monster that's Level 4. Use this card to increase their Levels, and you have your options.
Second, if this card is stuck in your Deck, and you want to bring it out, chip in a third monster that's a Level 4 WATER Fish-Type. Use that third monster to bring out "Shark Stickers", even from the Graveyard if possible, and Summon this card from the Deck using "Transmodify" on "Stickers". Thus giving you 2 monsters to Summon any Rank 3, 4, or 5 WATER monster (as long as it only requires 2 materials, anything past that is trivial).
If you're trying to avoid thinning out your own Deck, just use this card alongside "Silent Angler". It will give you access to most WATER Xyz Monsters.