Ouroboros, the Snake of Reincarnation (Full Art) (SKL-028) [The Seven Kings of the Lands]

When this card enters your field, remove all cards in your main deck from the game. Then shuffle all magic stones from your graveyard into your magic stone deck and shuffle all other cards from your graveyard into your main deck. When this card is put into a graveyard from your field, put it on the bottom of its owner's main deck.