Merchant's Dockhand is a rare Artifact Creature — Construct card from Aether Revolt (AER), collector number 163. Current market price: $0.10 (foil $0.39), TCGplayer market prices via Scryfall.
{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.