The Trial of Ushyldor

When The Trial of Ushyldor enters the battlefield, it deals 3 damage to each creature you control.
At the beginning of your end step, sacrifice The Trial of Ushyldor and put 3 +1/+1 counters on each creature you control that was dealt damage this turn.
"To those who survive, my power is yours. But to those who don't, an eternity of hell awaits."