Forum:Archfiend Emperor as an overlay material for a non-fiend xyz monster

Archfiend Emperor, the First Lord of Horror says "You cannot summon other monsters, except Fiend-type monsters." I've been playing under the premiss that, as soon as it is overlaied, it is no longer on the field, which means it's effect is no longer active. This would allow me to use it to xyz summon non-fiends. Recently, I was told this is wrong, and it cannot be used to xyz summon non-fiends. Could I get some clarification on this? Maybe a comparison to a similar ruling? Janoside89 (talk • contribs) 19:59, September 15, 2014 (UTC)