The point of this card is to be like parallel universe, except less effective when copying stats and more effective when copying skills. In addition, it's cheaper because the creature can be used against you.
What if you clone 5 air nymph? That'll be way OPed.
No, because first your opponent must NOT have fire quanta, or he would be able to make unstable gasses, too, which will stack upon whatever deck he already has AND kill your nymphs because they only have 2 HP, 1 when shattered. Then, you need to make sure your opponent has no deflagrations, steals, or pulvies. THEN, you need to make sure they have no devourers, or black holes (assuming you're duoing and powering gasses with only fire mark or powering shatters with only aether mark). THEN, you have to make sure your opponent has no CC to kill your weak 3|2 or 1|1 nymphs, and any of these combined with heals or stoneskins or miracles would be painful...
Upgraded, yes, shatter is cheaper, but so are all the PC and CC cards. Plus, you have to worry about SoDs, maybe combined with SoGs, or SoRing the nymphs you shatter to their side.
Test Deck (unupped):
Aether Mark
4 air nymphs
6 shatters
16 air pillars
4 fire pendulums
starting hands would theoretically average at 1 nymph, 1.4 shatters, 3.7 air pillars, and 1 pendulum
so that's 3-4 air quanta the first turn, so an nymph would only come out on turn 3 or 4, and by then the opponent should already have CC or PC in hand..it should take AT LEAST 6 turns to get enough unstable gasses because of lack of air quanta and whatnot, and ttw when not facing CC would probably average around 8-9. Shrieker rush, on the other hand, would be faster and has a greater chance against CC.
