It's not that its "a hard ask" to get three mana for a spell in vintage, obviously. It's just that the effect you get from Treasure Cruise isn't worth spending three mana in that format because of the opportunity cost. Hell, you can draw two cards AND get an extra mana _for free_ in Vintage.
To use a Legacy metaphor, there are plenty of decks that are happy to cast a four mana spell, but nobody plays Ernham Djinn.
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