Here are my thoughts on the event card and who might use it:
Us: I don't see it. It limits us too much to risk I think. Dragon blitz and a UG deck are the only real options we have and they are better respectively with PU and deflags.
Fire: They can do it but with no in element damage blocker or healing they would have to go almost straight rush. I doubt they would try something like that against us.
Darkness: They have pretty much everything they need in element including PC and airborne creatures, so they could potentially go mono against us.
Gravity: Doubtful they use it at all but if they do it probably will be a match where they can use upgrades so they can take advantage of an elite otyung/ grav shield combo or overdrive with armagio. It is possible we could face one of these but low probability.
Light: No cc no pc in element makes it unlikely. Their best stalls use some off element cards and I think they will try to stall against us again. If they decide to try it, my bet would probably be against darkness where they have several advantages.
Entropy: Definitely possible. I could see a diss shield stall with antimatters or pandamonium. There are a variety of strong monos they can build. This may be the most likely element to take a mono against us.
Aether: I don't think they will try it because mono aether when predicted is easily countered. However if they do decide to try it, we are probably a top candidate to try it against since we used very little PC round 1 but lots of CC.
Time: I can't see them trying a mono deck at all. They are really more of a duo element.
Earth: Earth can make some good monos but I think we are one of the least likely elements they try it against. I can see them taking an EQ/ graboid deck but not against us.
Most likely to take mono against us:Entropy, Darkness
Possible: Aether, Gravity
Unlikely: Fire, Light, Time, Earth
