Forum:Ghostrick-Go-Round ruling?

So, can Ghostrick-go-Round be used on both players battle phases? Only your battle phase? Or, both players battle phases, but only on your opponents if you didn't use it on your battle phase previously?

I'm not sure at which times Ghost-go-Round can be played exactly so any help would be nice, thanks! --Googrifflon (talk • contribs) 21:03, February 20, 2014 (UTC)