writ of execution
What the hot-tempered Queen of Hearts would have needed to actually chop off the heads of any of her subjects whom she happened to be displeased at.
Since the King of Hearts quietly told all of the condemned croquet-players, "you are all of you pardoned", it seems fairly doubtful that he would actually have scribed out a writ of execution in any instance, especially if it was merely because his wife the Queen wanted it so.