Cheapest priced copy (Aether Revolt): $0.49 at Card Kingdom, near mint, their price list as of .
Merchant's Dockhand 
Artifact Creature — Construct · 1/2 · Rare · Aether Revolt · #163
{3}{U}, {T}, Tap X untapped artifacts you control: Look at the top X cards of your library. Put one of them into your hand and the rest on the bottom of your library in any order.
Legal inCommanderPioneerModernLegacyVintage
Not legal inBrawlStandardPauper
2 printings · $0.49 to $0.79 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Aether Revolt | 163 | Rare | $0.49 | $0.49 |
| Aether Revolt Promos | 163s | Rare | — | $0.79 |
3 rulings from Wizards of the Coast
- 9 February 2017If the value of X is greater than or equal to the number of cards in your library, you can order your library as you wish.
- 9 February 2017Merchant’s Dockhand is tapped to pay the {T} cost. It can’t also be one of the X untapped artifacts you tap.
- 9 February 2017If the value of X is 0, you don’t look at or move any cards.