A topic from AEG's L5R CCG Rules forum, copied for Oracle of the Void from a copy of the forum saved in October 2015, so pages it didn't save are missing. Players' names are left out; the rules officials are named. Rulings are as they stood on these dates; later rulings, the rulebooks and the Rules Archive may differ.
I control a Shinsei's Tomb with a Ring under it. What happens to the Ring if another card's effect destroys the Shinsei's Tomb? (e.g. Raze to the Ground)
Unique Bow this card: Produce 2 gold. After you discard a Ring: You may put it under Shinsei's Tomb. Limited: Bow and destroy this card: Put all Rings that were under it when destroyed into your hand.
I control a Shinsei's Tomb with a Ring under it. What happens to the Ring if another card's effect destroys the Shinsei's Tomb?
http://rules.l5r.com/Areas_of_the_game# ... of_play.29: "If a card leaves play, all cards under it leave play in the same manner."