It is the only card that may be played this way.
The only card up his sleeve was the one he wasn't yet ready to play.
In the end, his lawyer played the only card he had left.
That was his only card, and he would have to play it carefully.
"We needed the health insurance, and this was the only card on the table," he says.
Hell, it was just about the only card he had left.
But it was the only card he had to play.
The written evidence of the threat was their only card.
For example, they are the only cards you can play on an opponent's king.
The other part of him played the only card he had left.