Egg of Geists

Reduce the casting cost of the first creature spell
you cast each turn by {1}
{1},{t}: Add {w},{u}, or {b}.
{w},{u},{b},{t}: Search your library for a Spirit
card and reveal that card. Shuffle your library,
then put the card on top of it.
"Scholars have determined the orb resonates with
the moon and holds sway over Geists.."