OK, let's round up the final group of two-color combinations.
Balefire Liege: devotion lord. One more mana than most of the others; still useful
Battlegate Mimic: Limited.
Belligerent Hatchling: useful, but not for devotion.
Duergar Assailant: Limited.
Duergar Hedge-Mage: useful, but not for devotion.
Duergar Mine-Captain: useful, but not for devotion.
Figure of Destiny: a classic. I would like to play as many as I can afford!
Hearthfire Hobgblin: great devotion, auto-include.
Hobgoblin Dragoon: Limited.
Nobilis of War: great devotion, nice effect, and it even flies!
Rise of the Hobgoblins: good in a token deck.
Scourge of the Nobilis: auto-include for devotion.
Spitemare: useful, not for devotion.
Cold-Eyed Selkie: a classic, and really good card draw.
Fable of the Wolf and Owl: good in a token deck.
Favor of the Overbeing: keeper for devotion.
Gilder Bairn: useful in block, but not for devotion.
Grazing Kelpie: Limited.
Groundling Pouncer: useful, but not for devotion.
Murkfiend Liege: devotion lord.
Overbeing of Myth: great devotion, nice card draw. The 'cards in your hand' clause sucks. I want to play my cards.
Selkie Hedge-Mage: solid, but not for devotion.
Shorecrasher Mimic: Limited.
Slippery Bogle: a classic, and the headliner of a powerful deck, but not for devotion.
Sturdy Hatchling: useful, but not for devotion.
Trapjaw Kelpie: Limited.
Wistful Selkie: high devotion and card draw, what's not to like!