Stream of Thought 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
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.)
Complete guide
Stream of Thought is a versatile blue sorcery that serves as both a milling engine and a powerful recursion tool. By utilizing the Replicate mechanic, you can multiply its effect to deplete an opponent's deck or restock your own library with vital resources.
What It Does
Stream of Thought has two primary effects: it forces a target player to mill four cards, and it allows you to shuffle up to four cards from your graveyard back into your library. The Replicate ability allows you to pay an additional cost of {2}{U}{U} any number of times as you cast it to create copies of the spell on the stack.
How It Resolves Step by Step
When you cast the spell, the Replicate trigger goes on the stack first. If you paid the replicate cost, copies are created and put on the stack above the original. Each copy resolves individually: first, the target player mills four cards; then, you choose up to four cards currently in your graveyard to shuffle in. Note that the physical Stream of Thought card remains on the stack until the very end, meaning it cannot shuffle itself back into the library.
Common Mistakes
A frequent error is trying to shuffle the Stream of Thought spell itself back into the library during its own resolution. Because the spell stays on the stack until it finishes resolving, it isn't in the graveyard yet to be selected. Additionally, if you replicate the spell, remember that the copies are not 'cast', so they will not trigger abilities that look for players casting spells.
When to Play It
This card is best played in control or combo shells that need to recover specific pieces from the graveyard. It is also a viable win condition in long games where you can use Replicate to mill the final cards of an opponent's library while ensuring you never run out of cards yourself.
Interaction examples
Ponder
PreordainIf you have Ponder and Preordain in your graveyard, you can cast Stream of Thought targeting yourself. You mill four cards, then you can choose the Ponder, Preordain, and two of the newly milled cards to shuffle back into your library.
If you cast Stream of Thought and pay the Replicate cost once, you have two instances of the spell on the stack. The first copy resolves, milling the target and shuffling four cards (like a Ponder) back in. Then, the original spell resolves. You cannot use the second resolution to shuffle back the first copy, as the copies cease to exist after resolving and never enter the graveyard.
Guide written with AI from the official text and rulings. Official English text prevails.
How it works : Stream of Thought
Original English text — Wizards of the Coast / Scryfall
- #1· Wizards of the Coast
Stream of Thought is still on the stack while you choose cards in your graveyard to shuffle into your library. It can’t shuffle itself into your library.
No other card is named in this ruling.
- #2· Wizards of the Coast
If you replicate Stream of Thought, the copies resolve before the original spell, so they can’t shuffle Stream of Thought into your library.
No other card is named in this ruling.
- #3· Wizards of the Coast
You choose which cards to shuffle into your library while Stream of Thought is resolving. If you target yourself with Stream of Thought, you may choose any of the four cards that you put into your graveyard or any cards that were there before.
No other card is named in this ruling.
- #4· Wizards of the Coast
You’ll copy Stream of Thought for each time you paid its replicate cost, even if it’s countered.
No other card is named in this ruling.
- #5· Wizards of the Coast
The copies that replicate creates are created on the stack, so they’re not “cast.” Abilities that trigger when a player casts a spell won’t trigger.
No other card is named in this ruling.
Legal formats
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Meta decks with Stream of Thought
No archived Top 8 deck with this card yet.