Use "Skreech" effect for dumping this card so you can revive it later through its effect
To easily get the monsters required to Special Summon this card, summon "Deep Sea Diva" to bring out a Level 3 or lower Sea Serpent-Type monster, then activate the effect of "Shark Stickers" to Special Summon it.
Summon "Deep Sea Diva" and use its effect to Special Summon "Atlantean Heavy Infantry". Use its effect to Normal Summon a third Level 3 or lower WATER monster from your hand, giving you the materials needed to summon this card.
You can also use "Call of the Haunted" to get out one of the monsters needed to summon this card, allowing you to return it to your hand to use again (with this card's effect).
"Ice Barrier" monsters have several acceptable monsters for this card's Special Summoning cost. Additionally, the bouncing of all Spell and Trap Cards fits the theme of "Ice Barrier" Decks and can provide fuel for "Gungnir, Dragon of the Ice Barrier" or other such cards.
Most Level 3 or lower WATER monsters are acceptable targets for "Salvage" or "Surface" which reduces this card's Special Summoning cost.
"Wind-Up Shark" can be used to summon this card by using its effect to make itself Level 3.
Use the effect of "Hammer Shark" to help fulfill this card's summoning requirements.
Level 4 WATER monsters can be tributed to special summon this card.
At that time the ATK of your opponents monsters is reduced by at least 900 by this cards effect if at least two more spells/traps are on the field in addition to the field spell. By reactivating the field spell this cards ATK and DEF is further increased by 200.
This card can be Tribute Summoned (without effect!) with just 1 tribute.
If you have 3 copies of "Atlantean Pikeman" in your Graveyard, you can use "Tri-Wight" to bring them back and use them for the effect of "Poseidra, the Atlantean Dragon". If you keep getting "Tri-Wight" back to your hand, you can keep Special Summoning this monster multiple times.
If you have this card and "Call of the Atlanteans" set on your opponent's turn. Activate "Call of the Atlanteans" to Special Summon your monsters, then during your turn you can summon another "Poseidra" and Xyz Summon "Mermail Abyssgaios" or any other Rank 7 monster, or attack with both "Poseidras" and then Xyz Summon for a Rank 7.
When this card is special summoned by its own effect it removes spells/traps with negative influence on it (like "Gravity Bind")..So this card could be played in a stall deck.
"Fishborg Blaster" is another monster that can be easily Special Summoned for this monster's cost.