When an opponent's monster declares an attack, or an opponent's monster effect is activated that would destroy a monster(s) on the field, and a monster that mentions "Shining Sarcophagus" is on the field: The next time each monster you control that mentions "Shining Sarcophagus" would be destroyed by battle or card effects this turn, it is not destroyed, also destroy all opponent's Attack Position monsters, then, if you control "Dark Magician", inflict 500 damage to your opponent for each monster destroyed by this effect
Always remember the purpose of ramp in your deck and what you're using it for
Relinquished is completely powerless if negated, as it has an ATK/DEF of zero
Basically, it can attack right away, doesnt tap when it does, can only be blocked by two or more creatures, and if it does get blocked, excess damage hits the enemy player
The Twitter/X announcement is full of comments bemoaning existing availability issues and doubting it'll be any different here