Amethyst

Black spells you cast cost {1} less to cast.

If a nontoken creature an opponent controls would die, instead exile it and you gain 2 life.

{4}{b}{b}, {t}: Put target creature card exiled with The Darkness Crystal onto the battlefield tapped under your control with two additional +1/+1 counters on it.

"Steven, your cactus seems really down on itself."