So i realised that there was a translation error on the card "Gravebreaker Lamia" in french, and kind of a troublesome one cause, the text on the card say:

"When Gravebreaker Lamia enters the battlefield, search your library for a card, put it into your graveyard then shuffle your library."

In french the text say:
"Quand la Lamie brise-tombe arrive sur le champ de bataille cherchez une carte dans votre bibliothéque et mettez la dans votre main puis mélanger votre bibliothéque."

"Votre main" means "in your hand" wich is the total opposite of what the card does.