Crystal Gem

{t}: Add {u} or {r}.
{u}{r}, {t}: Target instant or sorcery in your
graveyard gains flashback until end of turn. Its
flashback cost is equal to its mana cost.
A gem of infused titanite. Introduced to Lothric by the
Crystal Sages. Used in infusion to create crystal
weapons. Crystal weapons inflict magic damage, and
scale effectively with intelligence.