Castle of the Spirit Helix

Castle of the Spirit Helix enters the battlefield tapped. At the beginning of the next end step, if an opponent lost more than 5 life this turn, sacrifice Castle of the Spirit Helix.
At the beginning of your upkeep, Castle of the Spirit Helix deals two damage to you, and each opponent gains 2 life.
{t}: Add {w}{r}{g} to your mana pool.