Green creatures you control have trample.
Illustrated by Steven Belledin · Salvat 2011 · #157
There are no rulings for Roughshod Mentor.
Trample (This creature can deal excess combat damage to the player or planeswalker it's attacking.)
Other creatures you control have trample.
Trample
Sliver creatures you control have trample. (A creature with trample can deal excess combat damage to the player or planeswalker it's attacking.)
Multicolored creatures you control have trample.
Green creatures you control get +1/+1.
Intimidate (This creature can't be blocked except by artifact creatures and/or creatures that share a color with it.)
Other green creatures you control have intimidate.