Mystic Foxstone

{t}: Add {w} or {u}. If that mana is spent on a Fox
spell, gain 1 life.
{w}{u}, {t}, Sacrifice Mystic Foxstone: Search your
library for a Fox card, reveal it, put it into your
hand, then shuffle your library.
—
"Carved from the ancient stones of the sacred
grove, it channels the essence of the fox spirits."