You can Tribute 1 monster; Special Summon from your Deck, 1 monster with the same original Type, Attribute, Level, and ATK/DEF as the Tributed monster, but with a different original name. If you Tributed a monster Special Summoned from the Extra Deck, you can Special Summon a monster from your Extra Deck instead that meets those same criteria. You can only use this effect of "Nightmell the Dark Bonder" once per turn.