Cheapest priced copy (Rise of the Eldrazi): $0.35 at Card Kingdom, near mint, their price list as of .
Merfolk Observer 
Creature — Merfolk Rogue · 2/1 · Common · Rise of the Eldrazi · #76
When this creature enters, look at the top card of target player's library.
Legal inCommanderModernLegacyVintagePauper
Not legal inBrawlStandardPioneer
1 printing · $0.35 to $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Rise of the Eldrazi | 76 | Common | $0.35 | $0.49 |