3 Days Until The End

Exile this card under your control as you play it with 3 Day counters on it. At the beggining of a players upkeep remove a Day counter. Once there are no day counters, cast this card.
{2}: Remove a Day counter
Exile all permanents except for legendary lands. Half all players life totals, round down. Then, any player with life total 5 or less loses the game.
Kicker {b}{r}
If this spell was kicked, draw 2 cards at the beginning of your next endstep