Siphon Insight

You can cast a spell using flashback even if it was somehow put into your graveyard without having been cast.

You don't have to disclose which card you exiled and which card you put on the bottom of the library. For example, if your opponent knows what the top card of their library is and you cast Siphon Insight, you don't have to tell them where you put that card.

You must still follow all normal timing rules to play a card exiled with Siphon Insight.

If a card with flashback is put into your graveyard during your turn, you can cast it if it's legal to do so before any other player can take any actions.

A spell cast using flashback will always be exiled afterward, whether it resolves, is countered, or leaves the stack in some other way.

"Flashback [cost]" means "You may cast this card from your graveyard by paying [cost] rather than paying its mana cost" and "If the flashback cost was paid, exile this card instead of putting it anywhere else any time it would leave the stack."