Magic: the Gathering - Datenbank

Roiling Horror's power and toughness are each equal to your life total minus the life total of an opponent with the most life. Suspend X-[X][B][B][B]. X can't be 0. (Rather than cast this card from your hand, you may pay [X][B][B][B] and exile it with X time counters on it. At the beginning of your upkeep, remove a time counter. When the last is removed, cast it without paying its mana cost. It has haste.) Whenever a time counter is removed from Roiling Horror while it's exiled, target player loses 1 life and you gain 1 life.