Cove of the Greatest Treasure

Cove of the Greatest Treasure enters the
battlefield tapped.
{t}: Add {c}.
{3}, {t}: Sacrifice Cove of the Greatest Treasure,
chose 1:
-Create a colorless Treasure artifact token with
"{t}, Sacrifice this artifact: Add one mana of any
color."
-Create a blue 1/1 merfolk creature token with hexproof and put it on the battlefield tapped.