
The Darkness Crystal | Legendary Artifact | | 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. | Pablo Mendoza

Jecht, Reluctant Guardian | Legendary Creature | Human Warrior | Menace
Whenever Jecht deals combat damage to a player, you may exile it, then return it to the battlefield transformed under its owner's control. | Michael MacRae

Vincent Valentine | Legendary Creature | Assassin | Whenever a creature an opponent controls dies, put a number of +1/+1 counters on Vincent Valentine equal to that creature's power.
Whenever Vincent Valentine attacks, you may transform it. | Norikatsu Miyoshi

Squall, SeeD Mercenary | Legendary Creature | Human Knight Mercenary | Rough Divide — Whenever a creature you control attacks alone, it gains double strike until end of turn.
Whenever Squall deals combat damage to a player, return target permanent card with mana value 3 or less from your graveyard to the battlefield. | Yuu Fujiki

Kuja, Genome Sorcerer | Legendary Creature | Human Mutant Wizard | At the beginning of your end step, create a tapped 0/1 black Wizard creature token with "Whenever you cast a noncreature spell, this token deals 1 damage to each opponent." Then if you control four or more Wizards, transform Kuja. | Joshua Raphael

Jenova, Ancient Calamity | Legendary Creature | Alien | At the beginning of combat on your turn, put a number of +1/+1 counters equal to Jenova's power on up to one other target creature. That creature becomes a Mutant in addition to its other types.
Whenever a Mutant you control dies during your turn, you draw cards equal to its power. | Ignatius Budi

Noctis, Prince of Lucis | Legendary Creature | Human Noble | Lifelink
You may cast artifact spells from your graveyard by paying 3 life in addition to paying their other costs. If you cast a spell this way, that artifact enters with a finality counter on it. | Jeremy Chong