If you have no cards left in your library during a game, you will lose the game when you are required to draw a card but cannot. This is known as being "decked out" or "milled out."
When unstable unicorns run out of cards in hand during a game, they must draw a card from the draw pile. If there are no cards left in the draw pile, they are eliminated from the game.
If you don't yell "Uno" during the game, you may have to draw more cards as a penalty.
If you forget to say "uno" during a game, you may have to draw more cards as a penalty.
If you don't call "Uno" during a game of Uno, you may be penalized by having to draw extra cards.
When you don't call "Uno" during a game of Uno, you risk being penalized by having to draw more cards.
Yes, any cards in a library are part of the game. Note that 'library' refers to the stack of cards that you draw from. A more standard analog may be 'deck' but in the context of magic that refers to all cards you own in all zones and your sideboard.
If you forget to say "uno" during a game of Uno and another player notices, you may have to draw additional cards as a penalty.
When Magic: The Gathering players are unable to draw cards during their turn, they may not have enough resources to play cards or make strategic moves, which can put them at a disadvantage in the game.
If you forget to say "uno" during a game of Uno and someone else notices, you may have to draw two penalty cards as a consequence.
You call "Uno" when you have one card left in your hand during a game of cards.
In Magic: The Gathering, you can shuffle cards from the graveyard back into the library by using cards or abilities that specifically allow you to do so. Look for cards with effects like "shuffle target card from a graveyard into its owner's library" to accomplish this.
If someone calls "Uno" before you during a game, you may have to draw two additional cards as a penalty, depending on the rules being followed.