Cheapest priced copy (Betrayers of Kamigawa): $0.35 at Card Kingdom, near mint, their price list as of .
Stream of Consciousness 
Instant — Arcane · Uncommon · Betrayers of Kamigawa · #53
Target player shuffles up to four target cards from their graveyard into their library.
Legal inCommanderModernLegacyVintage
Not legal inBrawlStandardPioneerPauper
2 printings · $0.35 to $0.79 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Betrayers of Kamigawa | 53 | Uncommon | $0.35 | $0.79 |
| Ultimate Masters | 74 | Uncommon | $0.35 | $0.49 |
4 rulings from Wizards of the Coast
- 7 December 2018Stream of Consciousness can’t be one of the target cards you shuffle into your library.
- 7 December 2018You may target zero cards in any graveyard and have a target player simply shuffle their library.
- 7 December 2018If you target any cards in a graveyard and those cards all become illegal targets, the target player simply shuffles their library.
- 7 December 2018You choose the target cards; the target player doesn’t. They may offer suggestions.