less to cast.
: Put target creature card exiled with The Darkness Crystal onto the battlefield tapped under your control with two additional +1/+1 counters on it.The Darkness Crystal helps black decks cast spells more efficiently while interfering with opposing creature recursion. Black spells cost one generic mana less, and nontoken opposing creatures that would die are exiled instead while you gain two life. The artifact can later return a creature it exiled under your control, giving the removal replacement a potential long-term payoff.
Sacrifice effects such as Dictate of Erebos can force opposing creatures toward the graveyard, where the Crystal replaces their deaths with exile. That can prevent death triggers and ordinary reanimation from those creatures, while the life gain supports black decks using life for cards or abilities. Tokens are excluded from the replacement effect, so opposing token deaths still follow their normal course.
The six-mana activated ability puts a creature card exiled with that particular Crystal onto the battlefield tapped under your control with two additional +1/+1 counters. Choosing a creature with a strong entry ability can provide immediate value even though the body is tapped. If the Crystal leaves and returns, the new object does not automatically have access to cards exiled by its previous incarnation.
The spell discount removes generic mana only, leaving required black symbols unchanged. Build with enough qualifying spells to use that benefit consistently, and regard the activated ability as a late-game outlet. The strongest homes can exploit the life gain and exile replacement while naturally developing toward the mana needed to reclaim a useful opposing creature.
