Candy Diver The Courageous

This creature cannot enter the battlefield

If this creature is the only commander in the command zone at the beginning of any players upkeep, you may pay {u}{b}{r}, if its an opponents upkeep instead pay an extra {2}, to create one of these Legendary Artifact Tokens:
Regular Relic, Siren Statue, Pirate Sword, or Anchor.
If you control all four of these tokens during your upkeep while Candy Diver is alone in the command zone, create a Legendary Artifact Token named Black Pearl Shell.
If you control B