All-Terrain Modification

Modify{4}(equip this to a Vehicle you control. This remains equipped as long as the equipped Vehicle remains in play and remains an artifact.)
When All-Terrain Modification enters the battlefield, choose a land type. Equipped Vehicle has landwalk of the chosen type.
Equipped Vehicle has trample, menace, and annihilator 1.
"The only problem with the prototype involved sinew causing the tracks to squeak".