Flashback and Cards without a Casting Cost

[Tog]

If I had an active Dralnu in play or used something like Recoup, would it be possible for me to give a card like Ancestral Visions flashback and cast it out of my graveyard for free?

Thanks in advance.

[Tammit67]

If I had an active Dralnu in play or used something like Recoup, would it be possible for me to give a card like Ancestral Visions flashback and cast it out of my graveyard for free?

Thanks in advance.

As per its gatherer rulings:
10/15/2006 This has no mana cost, which means it can't be cast with the Replicate ability of Djinn Illuminatus or by somehow giving it Flashback.

[Infinitium]

The important distinction here is between the "mana cost" (which doesn't exist and thus cannot be paid) and "converted mana cost" (which is zero and may be referred to by other effects).