Forum:Worm Erokin

Is Worm Erokins effect mandatory? I always thought it was optional, but the other day my friends noticed that it doesn't say you can a worm face down, it just says once per turn flip a worm face down.

And if it is mandatory, when does it happen? Do I activate it during my Main Phases, or does it just happen during the End Phase? Aserik (talk • contribs) 02:55, August 3, 2010 (UTC)