There's a very good counter Aether can build, but because it relies on off-element cards, Air will always have more opportunities to tech in counter cards. This means you need two counter decks that rely on two different cards/strats, and the second one isn't nearly as consistent.. in fact it's not even a counter. With max discards at 20, you do get to keep your counter if it gets countered, so it's not an impossible situation. Very tough though, all because the Air deck is a mono.