Siphon Insight
Instant
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 
- CMC
- 2
- Mana cost
- Color identity
- BU
- Rarity
- rare
- Set
- Innistrad: Midnight Hunt
- Price
- $0.50
- EDHREC rank
- #4073
Siphon Insight lets you exile two cards from opponents' libraries and cast one of them this turn — card advantage and intelligence gathering stapled to a two-mana instant with flash. The cost is minimal; the upside of playing from your opponents' decks scales with table power.
Best Commanders
Commanders with the highest synergy
Tasha, the Witch Queen
Tasha, the Witch Queen creates a Demon token every time an opponent casts a spell from exile, which means Siphon Insight isn't just card selection — it's a token generator stapled to every spell you fire off from exile.
Gonti, Canny Acquisitor
Gonti, Canny Acquisitor rewards you for casting spells from opponents' libraries, and Siphon Insight is one of the cleanest ways to set that up at instant speed for just two mana.
Don Andres, the Renegade
Don Andres, the Renegade cares about playing cards you don't own, so Siphon Insight slots directly into the core engine — two exiled cards means two potential triggers waiting to happen.
Xanathar, Guild Kingpin
Xanathar, Guild Kingpin already lets you play cards from the top of opponents' libraries, and Siphon Insight stacks additional exile opportunities to keep the resource pipeline flowing.
Nathan Drake, Treasure Hunter
Nathan Drake, Treasure Hunter benefits from casting opponents' cards, and Siphon Insight's flash timing means you can set up your next turn's cast at the end of an opponent's turn without telegraphing your play.
Format Analysis
Where it lives, where it can’t
| Format | Verdict |
|---|---|
| commander | legal |
| legacy | legal |
| modern | legal |
| pioneer | legal |
| standard | not legal |
| vintage | legal |
| pauper | not legal |
| oathbreaker | legal |
Commander is where Siphon Insight does its best work — three or more opponents means the two exiled cards are drawn from a combined 297-card pool, dramatically increasing the chance of hitting something impactful. In Legacy and Vintage it's too slow and too low-impact against dedicated combo or tempo decks that punish two-mana do-nothing plays. Modern and Pioneer have enough interactive instant-speed options that Siphon Insight rarely makes the cut outside of niche theft-themed builds. Oathbreaker, like Commander, gives it enough targets to justify the slot.
Key Combos
Combo lines featuring this card
Price Context
Current price
$0.50 bulk tier
At $0.50, Siphon Insight is firmly bulk — an easy include that costs less than a draft pick. Bulk rares with high Commander inclusion tend to stay in this range unless a new commander pushes demand, so grab copies now rather than wait.
Explore
Sources
Mentioned
Updated . Data from Scryfall, EDHREC, and Commander Spellbook.