A Mulligan, in a game, happens when a player gets a second chance to perform
a certain move or action; usually due to lack of skill or bitter luck. A "Do-Over". Like getting an "Extra Play" in pinball due to sinking
the ball before obtaining
an arbitrary amount of points.
If your opening hand in Magic: The Gathering sucks bad; just call
"Mulligan", reshuffle, and draw new cards.