Trepanation Blade
Artifact — Equipment
Whenever equipped creature attacks, defending player reveals cards from the top of their library until they reveal a land card. The creature gets +1/+0 until end of turn for each card revealed this way. That player puts the revealed cards into their graveyard.
Equip 
Daniel Ljunggren
Iconic Masters (IMA)
• #231Rulings
If the equipped creature is attacking a planeswalker, the controller of the planeswalker is the defending player.
(wotc • 2017-11-17)
The land card is counted when calculating the bonus, and it will be put into the graveyard with the other revealed cards.
(wotc • 2017-11-17)
Rulings
If the equipped creature is attacking a planeswalker, the controller of the planeswalker is the defending player.
(wotc • 2017-11-17)
The land card is counted when calculating the bonus, and it will be put into the graveyard with the other revealed cards.
(wotc • 2017-11-17)