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death
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zombehs, WE NEEDZ ZOMBEHS!!! *clears throat*. its just not death if you dont have zombies in there.
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air
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i would think that air deserves some bird-like creatures.
i also think that air needs some WIND based cards.
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life
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something that revives, i know it sounds op, but there should be something that actually GRANTS life to things instead of healing
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light
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lets face it, light (In real life) is the fastest thing we know of, and i dont see that representation in elements. idk how that would work out though. maybe add some cards that changes creatures' positions on the field?
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water
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the only cards i have seen that legitimately seen that involves liquids are liquid shadow, nymphs tears, and flooding (that i can name off the top of my head)
post any card bases you can think of and make sure to involve the element it should belong to