My mono aether deck has a (just guessing) 30-40%ish win rate on gold arena, playing manually. (Funny enough, my win rate on bronze is maybe 60%, but the mild increase in win rate is offset by drastically weak reward.)
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I'm working on upgrading my Mono Aether. Right now I'm moving through my pillars/pendulums. I found that rising much more than 30 cards makes it harder to chain my shields together (too unreliable). So when push comes to shove, I chose to have more dragons than immortals. (Immortals are good to get damage out quick on a smaller budget. But once the quanta really gets going you will always* want dragons.)
I wish I had another electrocutor/lobotomizer, but not getting lucky enough to pop one. At least 1 out of every 3 losses seems to happen because I can't lobotomize a key creature early enough. I also wish I had more shards of gratitude, but then again I'm not sure if that starts to dilute the deck (see my first comment).
Here's the RoL deck I use for FG farming.
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It isn't amazing. I'd guess that I beat FGs 20%-25% of the time, if that. It sucks in the arena. But if I use mono aether to win in the arena, I can usually use that to fund my risky FG battles. That lets me sometimes draw an upgraded card, which I sell to keep my upgrades going.
In both instances, I usually get murdered by decks that have a lot of permanent-killers -- unless I can get my damage AND shields going early enough that I can weather a turn or two where my shields are down. I HATE empathy/creature spam decks.
I'm getting there.