you guys are right a monster can only attack 1 time per turn.
BUT when its flipped face down you no longer know if the monster is on the field, it has no attribute, no type, nothing. its completly blank, though you and i know that its
Gemini Elf.
now what happens is, it attacked, your still in the battle phase, you leave till you want.
you know
Book of Moon it. BOOM its no longer a monster, its just a monster wannabe face down on the field. for all we know its a
Cyber Jar.
now we play cease fire. it flips up. oh its in defense oviously it cant attack but if its in attack mode it normally would.
so you play
Zero Gravity now its in attack hence elligible for an attack.
Why is it that new monsters after
Cyber Jar can attack, if the case was that, that specific monster zone couldnt attack then the few zones that attacked that had monsters wouldnt be able to, but that isnt the case. they can and mostlikly half the time usually do.
as d_X stated and the rest, Yes it would be able to attack since its like a new monster on the field.
Book of Moon resets the conditions of that monster had attacked 1 time before.
its like when you attack with a monster, you then in battle phase ring it
and then
Call of the Haunted it back. since the monster was no longer there it can attack again.