I would be down for this. I used to hover around 1600 when I dueled a lot, but haven't really played the mode much in a while.
Funny how quickly you forget how to really play duel.
I really wanna participate, too bad it's not in EU.
"Even monkeys fall from trees."
Quite obviously you should take the ELO at the time of the announcement. But the main problem is that you wrote "Tired of getting owned by people with a higher elo then you ?" which to be honest is what is exactly going to happen in this cup. There is a huge skill gap between 1200-1300 and 1500 elo, even more that what you could have above 1500 elo in my opinion. So it's basically just a cup for people around the 1500 mark already.
http://qlranks.com/duel/player/roxolana Plus I've played over 300 duels on my account.
I'd do it, but I'm so rusty and bad at dueling right now that it's almost embarassing to play.