Drawn to the Pool

Enchanted Artifact or Creature becomes tapped and will not untap on controllers next turn. This enchantment can't be destroyed.
{2}{u}{b}: If the controller of Enchanted Artifact or Creature cannot pay this mana cost at the beginning of their upkeep, they must either sacrifice a Creature or lose 2 life. Once they have paid the mana cost, sacrifice enchanted creature.