Ulysses Klaue

When Ulysses Klaue enters the battlefield, exile
target artifact. For as long as it remains exiled,
you may cast that spell and you may spend mana
as though it were mana of any color to cast it.
"Klaue has escaped our pursuits for almost thirty
years. Not capturing him is perhaps my father's
greatest regret. I wish to bring Klaue back here to
stand trial." -T'Challa