Frogs, the format's biggest threat, are back! Well, they certainly aren't the biggest threat at the moment but they can put up a fight with
Toadally Awesome and some scary backrow. Or pass on a
Red-Eyes Dark Dragoon. That also works.
The deck suffers a lot from not having a way to search the most important card (
Swap Frog) besides Dupe Frog, which sadly misses timing most of the time. A nice thing about this particular build is that a single Swap Frog in your hand turns into a Red-Eyes Dark Dragoon.
The line of play with a Swap Frog and another water monster in your hand would go something like this:
Special summon Swap Frog by discarding a water monster.
Send a
Ronintoadin from your deck to the GY.
Return Swap Frog to your hand, and summon it again.
Trigger the effect of Swap Frog ONCE AGAIN, sending a frog from your deck, so Ronintoadin can summon itself.
Make
Marincess Coral Anemone, and summon the Swap Frog back to your field, sending a frog from your deck for the third time.
Ronintoadin summons itself, once again.
Make Toadally awesome, set some backrow and pass.
And if you don't draw a Swap Frog, set 4 and pray.