
Whenever a face-down creature you control enters, you may search your library for a basic land card, reveal it, put it into your hand, then shuffle.
Whenever a permanent you control is turned face up, if it's a creature, it gets +2/+2 until end of turn.
Illustrated by Raymond Swanland · Duskmourn: House of Horror Commander · #203
There are no rulings for Trail of Mystery.