The Dark

Season of the Witch

At the end of each player's turn, all of his or her untapped creatures that could have attacked but did not are destroyed. If you do not pay 2 life during your upkeep, Season of the Witch is destroyed. Effects that prevent or redirect damage may not be used to counter this loss of life.

At the beginning of your upkeep, sacrifice Season of the Witch unless you pay 2 life.
At the beginning of the end step, destroy all untapped creatures that didn't attack this turn, except for creatures that couldn't attack.