Where in the game of Magic: The Gathering does the instruction "put card on bottom of library" typically occur, and what are the implications of this action for gameplay?

The instruction "put card on bottom of library" typically occurs when a player is instructed to shuffle their library or when a card effect specifically requires a card to be moved to the bottom of the library. This action can impact gameplay by changing the order of cards in the library, potentially affecting the cards a player will draw in future turns. It can also be used strategically to manipulate the cards available to the player or to disrupt the opponent's plans.