Is there anything that can be done about cheaters?

[Zerilos]

Just played against a Darkclaw opponent who during the course of the game ended up playing 7 Shadow Knights and was obviously employing a cheat (as if playing Darkclaw wasn't bad enough). His user name was LACK03. Is there any method to report his behavior?

[GS]

...

Shadow knights can be recursed infinitely.

[PSUAth]

Did he have 7 on the field at the same time or did he play a total of 7 with less than 4 on the field where they died?

[Raphael Majere]

There is no way for more than 4 in a deck.

[Awall!!!]

I mean if it was physical cards then maybe. But 7 cards in a digital game where they have limits on cards is impossible. And you saying shadow knight. Who has an ability to bring back a dead ally?? But I see your annoyance though. Shadow knight is an annoying card. But he isn't cheating.

[BDK16]

Just played against a Darkclaw opponent who during the course of the game ended up playing 7 Shadow Knights and was obviously employing a cheat (as if playing Darkclaw wasn't bad enough). His user name was LACK03. Is there any method to report his behavior?

He probably played a Shadow Knight, his ability made a dead Shadow Knight come back to his hand. He did so until it looked like he played Shadow Knight seven times.

Hope that made it more clear