Hell Portal

At the beginning of each upkeep, summon {x}/ 2 rounded down; 2/2 demon token creatures
with flying. X is equal to the number of demon permanents you control. When this enters the battlefield you may have each player sacrifice a permanent for each player in the game, if you do before your draw step you take 1 damage for each demon creature token you control.
"What have we done. I did not signup for this!" - Apprentice Cultist