You can only activate 1 card with this card’s name per turn. If you have no monsters in your GY, you can activate this card from your hand.
(1) When your opponent activates a monster effect on the field: You cannot activate monster effects in the hand, GY, and banishment until the end of the next turn after this card activated from the hand resolves, also negate that effect, then, if you have a Trap in your GY, you can add 1 “Dominus” card from your Deck to your hand.