Stream of Thought
Sorcery
Target player mills four cards. You shuffle up to four cards from your graveyard into your library.
Replicate 
(When you cast this spell, copy it for each time you paid its replicate cost. You may choose new targets for the copies.)
- CMC
- 1
- Mana cost
- Color identity
- U
- Rarity
- common
- Set
- The List
- Price
- $1.72
- EDHREC rank
- #15298
Stream of Thought mills four cards, shuffles three cards from your graveyard back into your library, and does both for a single blue mana at instant speed — that's an absurd amount of text on a one-drop. The splice-onto-arcane clause is the ceiling: stack it onto any Arcane spell and it multiplies, making it the engine card for any deck built around that mechanic.
Format Analysis
Where it lives, where it can’t
| Format | Verdict |
|---|---|
| commander | legal |
| legacy | legal |
| modern | legal |
| pioneer | not legal |
| standard | not legal |
| vintage | legal |
| pauper | legal |
| oathbreaker | legal |
Stream of Thought is most relevant in Commander and Pauper, and for opposite reasons. In Commander, the splice-onto-arcane text is largely academic unless you're building an Arcane-themed deck, but the base mode — mill four, shuffle three back, instant speed, one mana — is a legitimately efficient way to stock and control a graveyard in blue value piles. In Pauper, it's a real engine piece: common-legal Arcane spells exist in meaningful numbers, and chaining Stream of Thought splices onto a single spell can mill a substantial portion of your deck in one burst, fueling dredge-adjacent and self-mill strategies. Legacy and Vintage have the card pool for it but better one-mana cantrips exist, so it only shows up in dedicated Arcane builds there. It's not a universal auto-include anywhere, but in the decks that want it, it does work no other one-mana instant does.
Key Combos
Combo lines featuring this card
Price Context
Current price
$1.72 cheap tier
At $1.72, Stream of Thought sits in the low-cost range where you pick it up without deliberating. It's a niche card with a specific home, so the price is unlikely to move much unless Arcane-tribal gets a high-profile Commander printing that pushes demand.
Explore
Sources
Mentioned
Updated . Data from Scryfall, EDHREC, and Commander Spellbook.