I think field changing cards are a good idea for elements, and some of them were implemented. Besides Nightfall /Eclipse, we have Sundial - both sides can´t attack for one turn, and Flooding.
Pandemonium and partial Unstable Gas are one-time field changing cards.
If you want more of them, suggest some.
But, think TWICE or even more often about them.
When I read thinks like this,
a field changing card for water could go something like this , +2/+1 for water creatures and -2/-1 for fire creatures not really stomping out the fire rush but at least giving water an advantage against one and also a disadvantage but at least fire rush wouldnt be so simple
I think: "Do you know, what -2/-1 means for Fire ?". It means 0/0 Ash Eaters, 5/0 or 2/0 Phoenixes and 3/0 or 5/0 Golems.These are some of the most important fire creatures. That´s why Fire decks don´t like Fire Shield and Thorn Carapace in opponent´s deck, and this example shows me, that you should think once more about your field card ideas.
Elements have "personalities".
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The pairs of elements are:
Darkness- Light
Death - Life
Fire - Water
Earth - Air
Entropy - Gravity (!)
Aether - Time (!)
You can see them, when you open the trainer and choose elements, and you WERE able to see them, when the "Metamorphosis button" existed.
And one last thing:
Please use capital letters, punctation and "Return". It´s really hard to read your text, and I think you don´t want people to call you "Mr Wall of Text" and make jokes about it.P.S.
I know, I use capital letters too much. I´m german.