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You cannot use "Monster Reborn", etc. on "Mazera DeVille" even if he is Special Summoned properly, because he "cannot be Special Summoned, EXCEPT by…".
The only way you can Special Summon this card is via its own procedure. Even if it was initially summoned that way, you still can't summon it with card effects.
If you Special Summon "Mazera DeVille", his effect activates, and your opponent chains "Mystical Space Typhoon" to destroy "Pandemonium" in a chain, "Mazera Deville"'s effect disappears because his effect needs "Pandemonium" on the field when the effect resolves, not just when it activates (just like "The Agent of Judgment – Saturn").
If your opponent has less than 3 cards in his hand, he must discard his entire hand.
If you Special Summon "Mazera DeVille", his effect activates, and your opponent chains "Mystical Space Typhoon" to destroy "Pandemonium" in a chain, the effect of "Mazera DeVille" disappears because his effect needs "Pandemonium" on the field when the effect resolves, not just when it activates (just like "The Agent of Judgment – Saturn").