Goat Format · April 2005
What the Goat Format rulings add to, or change from, the rulings above.
If "Sword of Deep Seated" is sent to the Graveyard in the middle of a chain resolving, the entire chain must resolve and then "Sword of Deep Seated" is placed on top of the deck.
Edison Format · March 2010
What the Edison Format rulings add to, or change from, the rulings above.
Sword of Deep-Seated's second effect is a Trigger Effect.
The second effect of "Sword of Deep-Seated" is a Trigger Effect.
If your "Sangan" equipped with your "Sword of Deep-Seated" is sent to the GY, the effect of "Sangan" and "Sword of Deep-Seated" form a Chain. You decide their order on the Chain.
If "Sword of Deep-Seated" is sent to the GY while resolving "Reasoning", its effect starts a new Chain after you finish resolving "Reasoning".