思考の流れ
ソーサリー
プレイヤー１人を対象とする。そのプレイヤーは、自分のライブラリーの一番上からカードを４枚自分の墓地に置く。あなたはあなたの墓地からカード最大４枚をあなたのライブラリーに加えて切り直す。
複製
（あなたがこの呪文を唱えたとき、あなたがこれの複製コストを支払った回数１回につき１つ、これをコピーする。あなたはそれらのコピーの新しい対象を選んでもよい。）
イラスト：
Modern Horizons#71コモン日本語適正
裁定
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.
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.
If you replicate Stream of Thought, the copies resolve before the original spell, so they can’t shuffle Stream of Thought into your library.
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.
You’ll copy Stream of Thought for each time you paid its replicate cost, even if it’s countered.