Dreamsea Admiral

Dreamcast (You may tap this creature while casting
an instant or sorcery. If you do, it pays for {1} of that
spell's mana cost.)
Whenever you tap Dreamsea Admiral to
dreamcast, create a colorless artifact Treasure
token with "{t}, Sacrifice this artifact: Add one
mana of any color."
Admirals of the Dreamsea travel oceans of stars to discover endless wonders.