Altar of Morality

When altar of morality enters the battlefield choose Dark or Light. At the beginning of your end step choose which ever option which was not chosen last.
Dark: All creatures get -2/-2, each player loses 2 life, and each player discards two cards at the beginning of their upkeep.
Light: All creatures get +2/+2, each player gains 2 life, and each player draws and additional two cards at the beginning of their upkeep.