Soros hedged against the Pound/De-Mark peg. I have doubts it can be done to the Euro (too strong) but it can be done to another currency of a weaker economy pegged which to the Euro, for instance the Bulgarian Lev (BGN).
Buy Inverse Equitiy ETFs that target european markets.
That's betting against the ECB. Dangerous game.
At some point, the ECB will have to face market realities.
There is a saying that the market can stay irrational for longer than you can stay solvent.
esp. if you are betring against the ECB
Sell heavily EU biased financial instruments, I guess, if you can find someone willing to let you short them.
Do you want to know how YOU can profit or how people like Soros do it?
If you're certain something declines in value, all you got to do is buy Put Options