Absolutely. Delve can be used any time you're casting the card by paying a cost that includes generic mana. Doesn't matter where you're casting the card from. Similarly, if you give Treasure Cruise flashback with Snapcaster Mage, you can use delve to help pay the flashback cost.
Private Mod Note
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I'm a former judge (lapsed), who keeps up to date on rules and policy. Keep in mind that judges' answers aren't necessarily more valid than those of people who aren't judges; what matters is we can quote the rules to back up our answers. When in doubt, ask for such quotes.
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GWUBRDraft my Old Border Nostalgia Cube! and/or The Little Pauper Cube That Could!RBUWG
Modern:WDeath & TaxesW | RUGRUG DelverRUG