The card is bought to prevent others at the table from getting it or the two extra cards.

You can't possibly bust, so the extra card will only help your hand.

Students' unions receive commission on every extra card that they sell.

If that extra card makes the total over 21, then the player busts.

The player on the right of the dealer gets two extra cards.

The caller will from now on have two extra cards in their hand.

Instead, we tossed in a stack of 10 sheets without the extra card and went to town.

Players have a choice whether or not to get extra cards.

The dealer has set rules as to when he takes extra cards for himself (or herself).

Some variations allow or require the player to play an extra card on top of the 8, thus setting the next suit.