Treasure Cruise

• WOTC Official Reminder Textofficial rules
  Delve — Each card you exile from your graveyard while casting this spell pays for .

• WWizards of the Coast2021-03-19
  Official Ruling
  Delve doesn't change a spell's mana cost or mana value. For example, Treasure Cruise's mana value is 8 even if you exiled three cards to cast it.
• WWizards of the Coast2021-03-19
  Official Ruling
  Because delve isn't an alternative cost, it can be used in conjunction with alternative costs, such as flashback. It can also be used to pay for additional costs that include generic mana.
• WWizards of the Coast2021-03-19
  Official Ruling
  You can exile cards to pay only for generic mana, and you can't exile more cards than the generic mana requirement of a spell with delve. For example, you can't exile more than seven cards from your graveyard to cast Treasure Cruise unless an effect has increased its cost.

Rulings via Scryfall

• WO
  Wizards of the Coast2015-03-23 · edited

  Treasure Cruise was banned in pauper on March 23, 2015. Over the past few months, the Treasure Cruise decks have become more efficient, and the Pauper metagame has become significantly less diverse. In the interest of bringing back that healthy metagame, Wizards of the Coast has decided to make a change. We look for the card most strongly identified with the change in the metagame and the loss of diversity. That card, Treasure Cruise, is now banned. Source: https://magic.wizards.com/en/news/feature/march-23-2015-banned-and-restricted-announcement-2015-03-23
• WO
  Wizards of the Coast2015-02-03

  Treasure Cruise was banned in modern on February 3, 2015. The newest blue kids on the block led to an overhaul of Modern like no other cards before them, changing how decks were built up and down a diverse metagame. Source: https://magic.wizards.com/en/news/arcana/brief-history-modern-banned-list-2015-02-03
• WO
  Wizards of the Coast2015-01-19

  Treasure Cruise was restricted in vintage on January 19, 2015. Again, Blue-Red Delver decks have been so successful at tournament play that they are hurting the diversity of the format. Source: https://magic.wizards.com/en/news/feature/banned-and-restricted-announcement-2015-01-19
• WO
  Wizards of the Coast2015-01-19

  Treasure Cruise was banned in legacy on January 19, 2015. Blue-Red Delver decks have been so successful at tournament play that they are hurting the diversity of the format. Source: https://magic.wizards.com/en/news/feature/banned-and-restricted-announcement-2015-01-19
• WO
  Wizards of the Coast2015-01-19

  Treasure Cruise was banned in modern on January 19, 2015. Decks playing the powerful card drawers have been winning a lot, and pushing a lot of other decks down in competitive play. In Modern, these cards are easy replacements for one another—while a Delver deck might use Treasure Cruise over Dig Through Time, banning one but not the other would do little to change the deck. Source: https://magic.wizards.com/en/news/feature/banned-and-restricted-announcement-2015-01-19