Thread:LionHeartKIng/@comment-25233179-20170530230840/@comment-25233179-20170608053741

"- When a card is sent from the field to the GY, the Treasure card it was underneath the sent card automatically activates." Not just when sent to Grave; as long as a card leaves the field, the Treasure Card is flipped face-up (it doesn't count as an activation).

Aside from that, a couple of things: -Both players' Treasure Decks are shuffled together at the beginning of the Duel, so the players can have some (possibly even all) of their opponent's Treasure Cards on their side of the field. Neither player can know how the Treasure Cards were spread on field until they are flipped face-up. -The ownership of the Extra Monster Zones when both of them have no monsters of them is a bit ambiguous. So in the case of an effect that makes the Medal Number of a Treasure Card on an Extra Monster Zone go to 0 while both Extra Monster Zones are "empty", that Treasure Card goes to the hand of the user of that effect.