Eidos the Underworld Monarch (DUAD-EN017)

If this card is Normal or Special Summoned: You can add 1 "Monarch" Spell/Trap or 1 monster with 2800 ATK/1000 DEF from your Deck or GY to your hand. You can declare 1 Attribute; make 1 face-up monster on the field become that Attribute. If you Tribute Summon a monster with 2400 or more ATK and 1000 DEF, while this card is in your GY: You can add this card to your hand or Special Summon it. You can only use each effect of "Eidos the Underworld Monarch" once per turn.