Merchant's Dockhand
Artifact Creature — Construct
, 
, 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.
Christine Choi
Kaladesh Remastered (KLR)
• #250Rulings
If 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.
(wotc • 2017-02-09)
Merchant’s Dockhand is tapped to pay the {T} cost. It can’t also be one of the X untapped artifacts you tap.
(wotc • 2017-02-09)
If the value of X is 0, you don’t look at or move any cards.
(wotc • 2017-02-09)
Rulings
If 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.
(wotc • 2017-02-09)
Merchant’s Dockhand is tapped to pay the {T} cost. It can’t also be one of the X untapped artifacts you tap.
(wotc • 2017-02-09)
If the value of X is 0, you don’t look at or move any cards.
(wotc • 2017-02-09)