Cheapest priced copy (Oath of the Gatewatch): $5.49 at Card Kingdom, near mint, their price list as of .
Thought-Knot Seer 
Creature — Eldrazi · 4/4 · Rare · Oath of the Gatewatch · #9
({C} represents colorless mana.)
When this creature enters, target opponent reveals their hand. You choose a nonland card from it and exile that card.
When this creature leaves the battlefield, target opponent draws a card.
Legal inCommanderPioneerModernLegacyVintage
Not legal inBrawlStandardPauper
6 printings · $5.49 to $17.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Oath of the Gatewatch | 9 | Rare | $5.49 | $14.99 |
| The List | OGW-9 | Rare | $6.49 | — |
| Oath of the Gatewatch Promos | 9s | Rare | — | $16.99 |
| Secret Lair Drop | 720 | Rare | $8.99 | $9.99 |
| Secret Lair Drop | 1151 | Rare | $14.99 | $17.99 |
| Special Guests | 39 | Mythic | $8.99 | $13.99 |