If "Caius the Shadow Monarch" banishes a DARK you control, while you control no other cards, you can Summon this card.
You can't ever activate 2 trigger effects from your hand in the same chain, so you can't summon this card and "Tragoedia" in the same chain.
If you have 2 or more "Gorz the Emissary of Darkness" in your hand when you receive damage, you can only Special Summon one "Gorz the Emissary of Darkness".
If the effect that inflicts damage to your Life Points is Chain Link 2 or higher, you cannot activate the effect of "Gorz the Emissary of Darkness".
If your opponent activates an effect that destroys the only card on your side of the field and also inflicts damage to your Life Points, you can activate the effect of "Gorz the Emissary of Darkness". If the destroyed card has an effect that activates at this time, you can still activate the effect of "Gorz the Emissary of Darkness". The effect of the destroyed card and the effect of "Gorz the Emissary of Darkness" will form a Chain.
If your opponent inflicts battle damage to your Life Points with a monster like "Airknight Parshath" or "Spirit Reaper", you can activate the effect of "Gorz the Emissary of Darkness". The effect of your opponent's "Airknight Parshath" or "Spirit Reaper" will be Chain Link 1 and the effect of your "Gorz the Emissary of Darkness" will be Chain Link 2.
If you activate "Mystical Space Typhoon" and your opponent chains "Judgment of Anubis", if they destroy the only monster you control with its effect and inflict damage to your Life Points, you can start a new Chain by activating the effect of "Gorz the Emissary of Darkness" if you don't control any cards.
If you inflict damage to your opponent's Life Points with a card effect and your opponent Special Summons "Gorz the Emissary of Darkness", when the damage inflicting effect of your opponent's "Gorz the Emissary of Darkness" activates, you can chain the effect of "Cyber Dinosaur".
If you select an 'Emissary of Darkness Token' with "Shrink", its ATK becomes 0.