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
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Although not specifically identified at the time, Bastion drew a card that he referred to as the "key card" for Jaden's defeat, in Yu-Gi-Oh
Spells and Traps, on the other hand, are not that different from one another - both act as surprise mechanics in the Battle Phase - and so which you decide to pick here will be down to your personal preference
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
Relinquished is completely powerless if negated, as it has an ATK/DEF of zero