treasure deck yugioh Man-Eating Chest - Starter Deck: Yugi You can only activate this card in response to the activation of an effect that would return this card from the field to the hand Treasure Panda - Yu-Gi-Oh! Card

From the Shadow of Infinity: Special Edition set

Yes, graveyard hate can cause cards to leave the graveyard , depending on how it functions

Whilst Shaymin was able to return to your hand fairly freely and go again with its "Sky Return" attack, Dedenne will need to use its GX attack "Shock Return GX", dealing 50 damage and returning Dedenne and all cards attached to it back to your hand

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You can't respond to the backup ability by giving Boon-Bringer Valkyrie additional abilities and have backup give those abilities to the backup target

One copy of the Masters Key sold for $26,900 in a past PWCC auction