Forum:Archlord Zerato

I was wondering how Archlord Zerato's effect works. It states that if "Sanctuary in the Sky" is on your side of the field, discard 1 light monster card... Is this mandatory? It doesn't say "you can..." it just says "discard..." Also how many times can you use this "destroy all monsters" effect? Once per turn, once it's summoned, or however many times you want? And is Archlord Zerato worth putting into a Sanctuary in the Sky deck? I'm debating between Archlord Zerato or Neo-Parshath, the Sky Paladin. Sky Paladin is really expensive though. 75.37.162.218 (talk) 00:09, February 17, 2011 (UTC)