Cheapest priced copy (Jumpstart): $0.35 at Card Kingdom, near mint, their price list as of .
Thought Collapse 
Instant · Common · Ravnica Allegiance · #57
Counter target spell. Its controller mills three cards.
Legal inCommanderPioneerModernLegacyVintagePauper
Not legal inBrawlStandard
3 printings · $0.35 to $4.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Jumpstart | 184 | Common | $0.35 | — |
| The List | RNA-57 | Common | $0.39 | — |
| Ravnica Allegiance | 57 | Common | $0.39 | $4.49 |
One ruling from Wizards of the Coast
- 25 January 2019A spell that can’t be countered is a legal target for Thought Collapse. The spell won’t be countered when Thought Collapse resolves, but its controller will still put the top three cards of their library into their graveyard.