Stranded in the Storm

Each player sacrifices all tapped creatures he or she controls, then tap all creatures in play.
"As the blizzard worsened, I began to fear I may have made the wrong choice. I could turn back if I wanted, I'd just have to wait out the storm. Just then, I caught a glimpse of a gargantuan, long ago claimed by these same winds. Wrong choice or not, If I stopped now, I'd surely share his fate."
-Alvis, the Wanderer