When your opponent attacks with a monster that you Tribute Summoned, and your opponent took control of, you can activate "Blast Held by a Tribute".
Monsters like "Tyrant Dragon" cannot negate the effect of "Blast Held by a Tribute".
In order to inflict 1000 points of damage to your opponent, you must destroy all monsters on your opponent's side of the field first. So if you activate "Blast Held by a Tribute", and your opponent chains "Ring of Destruction" or "Interdimensional Matter Transporter" so that your opponent has no monsters to destroy, then "Blast Held by a Tribute" inflicts no damage.