Ziant, Thing of Nightmares

At the beginning of your end step, each player
takes damage equal to the amount of damage they
took this turn.
{x}{x}{b}{b}{r}{r}, {t}, Target player and all creatures
and plainswalkers he or she controls take X
damage.
"I thought it only existed in my nightmares. Until I
saw it take everything away from me right before my
eyes."