this seems to be a preconceived concept, and not one made by Zanz himself. Nowhere does it say that a nymph should not be immortal. Just like it never says a weapon should not be immortal, or a creature have momentum.
Light nymph is strong attack and defense. Aether Nymph Is moderate attack, and horrible defense.
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Light Nymph requires nothing for its ability, Aether nymph requires 3
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The card that has light Nymphs ability has the same cost. Same with the Aether Nymph
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Light Nymphs ability synergizes PERFECTLY with its element, and the cards in it. Aether Nymph has no synergy with its cards, and only 1 card in all of aether is benifited from it.
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Light Nymph is the ONLY creature that can use its ability. Aether nymph has competition, and that competition can use it more efficiently, and is better than Aether nyph in virtually every way.
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Idk, personally, that doesn't seem balanced to me.