The way I think of them is as a mulligan in a trading card game like Magic. Sometimes you have a hand you can't keep, and it's better to draw a new hand with o

The way I think of them is as a mulligan in a trading card game like Magic. Sometimes you have a hand you can't keep, and it's better to draw a new hand with one fewer card. Don't want to do that too many times, or you will almost certainly have a losing hand.