I am wondering: Why give spell duplication to Air? Is this a card that would be repeated for each element or is there a good reason to only give Air this ability?
It sounds balanced and looks interesting.
I feel that the HP of creatures is almost irrelevant because of the lack of efficient CC. Many complain that Gravity creatures, for example, suffer because they have higher costs due to their higher HP, which has little utility in the current metagame. The most effective CC IMO does not damage the creatures, but nullifies them through rewind, AM, or lobotomize.
So my intention is not spell duplication but increased CC efficiency and I felt it awkward to make a card working only with spells that target creatures. So I limited it by element instead. Fire and Air have the most damage-based spells and of course, Fire Bolt and Firestorm would be considerably OP with this effect. Flying weapon just happened to get the advantage, too, and I don't think that would be OP because flying weapon decks rely on a combo that can be prone to bad draws and is vulnerable to rewinds and the like.
Reviewing the card, I think having the ability disappear after a turn is UP and will change the wording so that it says 1 use instead of 1 turn.
