Alright so this is my decklist for Greydel-Kaiju. 

No picture can be shown at the moment so you will have to rely on the text, sorry. 
Total Cards: 40 
Monsters: 17

- Dogoran, The Mad Flame Kaiju: 3. This card is just there to have a nice 3000 atk monster, its best to summon this out when you know you can take control of it on the same turn or if you have a greydle monster.

- Gameciel, The Sea Turtle Kaiju: 3. This card is good for the deck since its a water attribute monster and can be targeted by Greydle Dragon's effect and plus since im using moray of greed it works for that too. Other then that pretty much its the same with Dogoran. 

- Greydle Slime: 2. This is the turner of the Greydle's. It has a great effect which is when you destroy 2 face up greydel cards, you can special summon it and then when its summon that way you can target one Greydle monster in your graveyard and special summon it. This can be used to go into lvl 8 synchro monsters such as Greydle Dragon which would be preferred.

- Debris Dragon: 1. This is here to summon out black rose dragon if you really need it out.

- Greydle Eagle: 2. This card can be targeted by Slime's effect so that you can gain this cards effect which if its destroyed by a monster effect, you can take control of 1 monster your opponents control. Greydle's can be an op deck. All the lvl 3 Greydle's have the effect that if they are destroyed by battle or by another way such as monster effects, spells, and traps they can target 1 card on my opponents field and take control of it permanently.  (Until either the monster is destroyed or the equipped Greydle is destroyed, either way that card is going to its owner grave).

- Greydle Cobra: 3. This is a really good card, if its destroyed by battle or a trap card you can target 1 monster your opponents control and take control of it. You could use the trap "Greydle Split" and target cobra then use the traps effect to destroy cobra, special summon 2 Greydle's, and get cobra's effect.

- Greydle Alligator: 3. This is the same as cobra but instead it has to be destroyed by battle or spell card's effect. 
Spells: 13

- Owner's Seal: 2. I know what your thinking why run owner's seal in a greydel deck. Well that's because sometimes you wont get any Greydel's in your starting hand and you want to gain control of your Kaiju's so its best to have it at 2 cause for me, I normally always get this card in my starting hand.

- Moray of Greed: 1. I can see you call questioning why this card is in this deck. That is because i need draw power, Moray has the effect that targets 2 water attribute monster's in my hand and puts them back into my deck and shuffles my deck, then i can draw 3 cards. Yeah its petty useful considering that this deck has a majority of water attributed monsters, the only one not water attributed is Dogoran. 

- Soul Charge: 1. No need to explain this card, you all know its effect and why its in the deck. 

- Upstart Goblin: 3. This card soul use is draw power which is something this deck did lack, until my recent changes. 

- Twin Twister: 2. Again like Soul Charge you all know its effect and why its in the deck. 

- Greydle Impact: 2. This is the main and only Greydle spell card. It has 2 effects which can be used only once per turn. Target one Greydle card (other then impact) and 1 card your opponents control, destroy them. 2. During the end phase of your turn you can add 1 Greydle card from your deck to your hand. This spell is very useful although I only use it for its second effect. 

- Supply Squad: 2. Since a lot of the monster's in the deck are going to be destroyed, its best to have this card in the deck so that when they are destroyed you can draw 1 card. Same goes for monsters that you control that was taken from your opponents field if they are destroyed (I think).

Traps: 10 

- Bottomless Trap Hole: 1. Just there in case I need to stop my opponent from summoning monsters that could destroy me. 

- Greydle Split: 3. This is an op trap card, you can target 1 card you control it gains 500 atk and on that same turn you can use its second effect which is that you destroy the monster equipped with this trap card and special summon 2 Greydle monsters from deck to the field. This can be used as a combo with cobra which gains its effect if it is destroyed by a trap card. You pretty much want to summon Slime and another lvl 3 Greydle monster so that you can synchro into Greydle Dragon or another lvl 8 synchro monster. Its better to go for Greydle Dragon but its entirely up to how you see the field.

- Jar of Avarice: 2. This is another card you call can question. I have it there because sometimes i run out of Greydle monsters in my deck so i have 2 of these just to get 5 cards in my graveyard back into my deck and i also get to draw 1 card. So yeah its there just so that i don't have to run out of monsters, or cards for that matter. XD

- Greydle Parasite: 3. This is the second and last trap card for Greydle's. It has 2 effects, 1. When your opponent declares a direct attack you can special summon 1 Greydle monster from your deck in attack mode. 2. When a Greydle monster you control attacks your opponent directly you can target 1 card in their graveyard and special summon it on their side of field, however your opponent must control no monster cards on their field for that effect to activate. Normally this trap is used for its 1st effect which is pretty neat cause it can either stop attacks or your opponent will be damage hungry and attack the Greydle which then you can gain control of the monster that are on your opponents field. Here is a tip if you do use its second effect, if your opponent has Clear Wing in their grave do not summon it, it will negate the Greydle's effect. 

- Solemn Strike: 1. Again you all know its effect and why its in the deck. 

Extra Deck: 15 

- Stardust Dragon: 1. No need to explain why its there, you all should know why. 

- Scarlight Red Dragon Archfiend: 1. A good lvl 8 synchro that has an effect that can really ruin the day for your opponent. Once per turn you can destroy as many special summoned effect monsters on the field as possible that has attack equal or less then this card. This card has 3000 atk so you can pretty much destroy any special summoned monster. XD

- Hot Red Dragon Archfiend: 1. Its effect is pretty good, once per turn during my main phase i can destroy all other faced up attack position monsters on the field. So this could work out with Supply Squad if you have monsters that are destroyed by this effect. 

- Greydle Dragon: 2. This is the main card of the deck. It can only be summoned by 1 aqua type tuner + 1 non turner monster. Its effect is that when it is synchro summoned, you can target cards your opponents control up to the number of water monsters that was used for its summoning and destroy them. Since you will be using Slime and another Greydle for its summoning, you will be able to destroy 2 cards your opponents control and I mean any card from Gaydulum to spell and trap cards. It also has another effect which is when it is destroyed by battle or card effect, I can special summon one other water monster in my graveyard but its effect is negated. So the smart choice would be to target a lvl 3 Greydle or you could target Gameciel. 

- Scarp Dragon & Thought Ruler Archfiend: both at 1. These cards are there because I wanted them there nothing else to say move on. Razz 

- Black Rose Dragon: 1. Its there just in case i need to nuke the field however to summon it you need Debris Dragon which might be hard to draw unless your lucky. I never draw Debris Dragon. 

- Number 47, 17, 20, 49, Ghostrick Alucard, Angineer, and Zenmaines: all at 1. They are there just because i wanted them there. 

Hope you all enjoyed the deck profile, I do however want to hear feedback like any changes to the deck and why. Also do not say add Waterfront, that card is a liability to me since my opponent , if they have to keep the kaiju can use its effect. Unless you can provide good clear reasons why I should.