Siphon Insight is one of those cards players keep asking about. Here is, in plain words, what its official text says, the rulings published by Wizards of the Coast, and the combos players actually run.
Official card text
Look at the top two cards of target opponent's library. Exile one of them face down and put the other on the bottom of that library. You may play the exiled card for as long as it remains exiled, and you may spend mana as though it were mana of any color to cast that spell. Flashback
Complete guide
Siphon Insight is a clever Dimir instant that allows you to turn your opponent's library into your own personal resource. By exiling their best tools face down, you gain information and card advantage while keeping your opponent in the dark. This card is especially potent because it can be cast twice thanks to its Flashback ability.
What it Does
When you cast Siphon Insight, you choose a target opponent and look at the top two cards of their library. You exile one of those cards face down and put the other on the bottom of their library. You gain the permanent right to play that exiled card, and you can spend mana as though it were any color to do so. Note that your opponent never gets to see which card was exiled as long as it remains face down.
Step-by-Step Resolution
First, the spell targets an opponent and goes on the stack. Upon resolution, you look at the top two cards of that opponent's library. You make a choice: one card is exiled face down, and the other is placed on the bottom of the owner's library. The permission to play the exiled card is tied to the card itself being in exile; even if Siphon Insight leaves your graveyard, you can still cast the exiled spell or play the exiled land later, provided you follow normal timing rules.
Common Mistakes
A frequent error is forgetting that Siphon Insight does not change when you can play the exiled card. If you exile a creature or a sorcery, you can only cast it during your main phase when the stack is empty. However, if you exile a land, you can play it as your land for the turn. Another mistake is thinking the Flashback cost must be paid immediately; you can cast the spell from your hand, let it go to the graveyard, and then pay the Flashback cost on a later turn to repeat the effect.
When to Play It
Because it is an instant, the best time to cast Siphon Insight is usually at the end of your opponent's turn. This allows you to keep your mana open for counterboarding or removal during their turn. Using the Flashback ability is a great way to use extra mana in the late game to dig for a win condition from your opponent's own deck.
Interaction examples
CounterspellYou cast Siphon Insight targeting your opponent. They respond by casting Counterspell to stop the effect. Because Siphon Insight is still on the stack, it hasn't resolved yet. If their Counterspell resolves, Siphon Insight goes to the graveyard without you looking at any cards. However, since Siphon Insight has Flashback, you can try to cast it again from your graveyard on a future turn by paying {1}{U}{B}.
An Offer You Can't RefuseYou cast Siphon Insight from your graveyard using its Flashback cost. Your opponent casts An Offer You Can't Refuse to counter it. Even though the spell was countered, the Flashback rule states that if the spell would leave the stack for any reason, it is exiled instead of going anywhere else. You will still receive two Treasure tokens from An Offer You Can't Refuse, but Siphon Insight is exiled permanently and cannot be cast a third time.
Guide written with AI from the official text and rulings. Official English text prevails.
How it works : Siphon Insight
Original English text — Wizards of the Coast / Scryfall
- #1· Wizards of the Coast
You can cast a spell using flashback even if it was somehow put into your graveyard without having been cast.
No other card is named in this ruling.
- #2· Wizards of the Coast
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.
No other card is named in this ruling.
- #3· Wizards of the Coast
"Flashback [cost]" means "You may cast this card from your graveyard if the resulting spell is an instant or sorcery spell 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."
No other card is named in this ruling.
- #4· Wizards of the Coast
A spell cast using flashback will always be exiled afterward, whether it resolves, is countered, or leaves the stack in some other way.
No other card is named in this ruling.
- #5· Wizards of the Coast
To determine the total cost of a spell, start with the mana cost or alternative cost (such as a flashback cost) you're paying, add any cost increases, then apply any cost reductions. The mana value of the spell is determined only by its mana cost, no matter what the total cost to cast the spell was.
No other card is named in this ruling.
- #6· Wizards of the Coast
You must still follow any timing restrictions and permissions, including those based on the card's type. For instance, you can cast a sorcery using flashback only when you could normally cast a sorcery.
No other card is named in this ruling.
- #7· Wizards of the Coast
Only you get to look at the exiled card. Its owner doesn't get to know what it is while it is in exile unless you tell them.
No other card is named in this ruling.
- #8· Wizards of the Coast
You may play the card even if it is a land.
No other card is named in this ruling.
- #9· Wizards of the Coast
You must still follow all normal timing rules to play a card exiled with Siphon Insight.
No other card is named in this ruling.
- #10· Wizards of the Coast
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.
No other card is named in this ruling.
Legal formats
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Meta decks with Siphon Insight
No archived Top 8 deck with this card yet.