
Soulbond (You may pair this creature with another unpaired creature when either enters. They remain paired for as long as you control both of them.)
As long as this creature is paired with another creature, each of those creatures has "{T}: Target player mills two cards."
Stern Mentor has 1 printing, first in Avacyn Restored (2012). EDHREC ranks it #28,668 among Commander cards. It appears most in Will Kenrith decks (1 on EDHREC).
Deck counts from EDHREC.
Cards that show up in the same decks on EDHREC.