Conspiracy Unraveler Bug
Conspiracy Unraveler can´t cast cards with flashback from the graveyard. I have spoken to a judge and you should most definately be able to so, since the oracle text is missing the "from your hand" line featured on Omniscience.
1
vote
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Rezzahan#77802
commented
Collecting evidence 10 rather than paying the mana cost is an alternative cost. So is flashback. You can only apply one alternative cost to a spell you cast. If you want to use flashback, you cannot also apply the Unraveler's collect evidence, and vice versa.
601. Casting Spells
[...]
601.2b
[...]A player can’t apply two alternative methods of casting or
two alternative costs to a single spell.[...]