Hi there. I'm an old M:tg player, who's been playing Elements for some time, but I never had a deck that I thought was good enough or original enough to share until now. It's also fun to play! I've been beating level 5 in the trainer with it all day, I only lost once (is that good?). And I hope it's original, at least I haven't seen it posted. I saw that Air/Aether was in the bottom tier in that duo deck thread, which suggests that no one's had much luck with the combination. Although I'm not sure if this would be considered two element, three element because of the mark, or four element because it generates fire as well... Anyway, here it is:
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7ms 7ms 7ms 7ms 7ms 7ms 7ms 7n3 7n3 7n3 7n3 7ng 7ng 7ng 808 808 808 808 808 808 80d 80d 80d 80d 80d 80e 80h 80h 80h 80h 8pn
So by the time you play a Queen, preferably with a Quintessence, You should have enough Life quanta to start churning out Fireflys, and even when you run out you can keep making one every other turn, which is plenty because they're only there to soften up the opponent and generate fire quanta. Then obviously an Air Nymph with Quintessence and start making Unstable Gasses. Phase Shields as needed.
One of the strengths seem to be that the quanta distribution works out nicely, so that you can almost always play creatures and support cards on the same turn. Another is the multiple ways to deal damage. In some games I went against an opponent with a reflect shield but I was able to kill them with firefly damage, and other times I couldn't get any creature damage in, but the unstable gas did the job. It's versatile. If you're safe behind your shield and your firefly army is kicking butt, you can just save up gases for a final blow, but if you're in trouble and you need to clear the board you can fire them off as you make them, leaving only what you put quintessences on. Firing five gas bombs in a single turn is so much fun!
If I were to add anything it would be a single Wind Tower.
Let me know what you think!