Exxod, Master of The Guard
© Can't be Normal Summoned/Set.
© Must be Special Summoned (from your hand) by tributing 1 "Sphinx" monster.
① If an EARTH monster is Flip Summoned: Your opponent takes 1000 damage.
(This card must be face-up on the field to activate and resolve this effect).
● 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.