Concerning how swimming creatures will eventually get tired swimming and drown, that is not true because a frog can just float on top of the water with no effort. I've raised frogs before, and I raise them in a fish tank which means no land whatsoever and there were no frogs dying from drowning for the 2 years I've raised them. As for flying creatures need to eventually land, there is a kind of swallow that never land for most of its life except for before they can fly and when they are mating and breeding. Also, I don't think 1 turn in an elemental battle is that long so it wouldn't make sense that they die after 1 turn in any case. As for someone's suggestion that forest spectre shouldn't die, that wouldn't make sense since plants that can live in water are much different from plants on land, and even those that could live in water will be rooted by the flood. Fate eggs should not survive because a egg actually breaths, the fetus in the egg still needs oxygen.
You know what, I'm sick of arguing real-world situations. Of course, I can point out that the life spans of frogs fare exceed 2 years, and I can argue the usage of the term "a kind" of swallow, but I won't. You know why?
Consider this. Let's say that we implement all your suggestions. Let's say that we allow Fireflies, Wyrms, Dragons, Frogs, and Spirits to survive under Flood. Heck, you can even say that flying weapons survive with Flood. Okay, cool.
Now what? How are players going to know that these creatures don't die? There are three ways.
1) On EVERY card that can survive with Flood, you write, "This card can survive Flood".
There are several reasons why this is bad. First off, you're adding many additional lines of text, just to solve a very simple issue that can just be ignored.[/li] Dragons and Frogs are unique in that they are vanilla creatures. You are removing that aspect from them.[/li] It gets confusing. You're going to have to document a list of all the creatures who can survive Flood, and compare, and you don't have to at all.[/li] You're making up an ability to simply counter ONE CARD. So much more confusion and text simply to fix up a small facet of ONE CARD.[/li]
2) On the Flood card, you indicate: "Water creatures, Air creatures, Frogs, Forest Spirits, and Dragons can survive Flood."
Flood has just turned into a very confusing card.[/li] This will cause more harm than good. People will be confused as to why some creatures are exempt from Flood while others aren't; it may not be as apparent to some as it is to others.[/li]
3) On the Flood card, you say: "Certain cards may bypass Flood" to simplify things (like Adrenaline).
Adrenaline was bad enough. We don't need more confusion to new players.[/li]