Torment Hall

When Torment Hall enters the battlefield
sacrifice {x} creatures under your control. Return {x} creatures from your graveyard. All creatures summoned this way gain regeneration. Cards
returned to the graveyard or exiled with this
ability come back onto the battlefield and lose regeneration if obtained from this card.
{1}{b}{b}: Put a -1/-1 counters on target creature.
"Over, and over, and over, and over..."