Néos des Ténèbres, HÉROS Élémentaire POTD-FR033

"Neos, Elemental HERO" + "Neo-Spacian Black Panther" This card can only be Special Summoned from your Extra Deck by returning the above cards from your field to the Deck. (Do not use the "Polymerization" card). You can select 1 face-up Effect Monster on the field if 1 is not already selected by this card. While you control this face-up card, the effect of the selected monster is negated until it is removed from the field. (You can only select 1 monster at a time with this effect.) This card returns to the Extra Deck during the End Phase.