22 cards where the illustration contains “kolaghan-mardu-go...”

Ankle Shanker (Commander 2016 #178)
Ankle Shanker (Khans of Tarkir Promos #164)
Butcher's Glee (Dragons of Tarkir #90)
Collateral Damage (Fate Reforged #95)
Compound Fracture (Arena Beginner Set #46)
Dragonlord's Servant (Year of the Dragon 2024 #1)
Frenzied Goblin (Friday Night Magic 2015 #1)
Goblin (Khans of Tarkir Tokens #7)
Goblin Bombardment (Duel Decks: Speed vs. Cunning #24)
Goblin Boom Keg (Fate Reforged #159)
Goblin Heelcutter (Fate Reforged #102)
Hordeling Outburst (Khans of Tarkir #111)
Hordeling Outburst (Friday Night Magic 2015 #3)
Jeering Instigator (Khans of Tarkir #113)
Jeering Instigator (Ugin's Fate #113)
Mardu Scout (Fate Reforged #108)
Ponyback Brigade (Khans of Tarkir #191)
Shambling Goblin (Dragons of Tarkir #118)
Vandalize (Dragons of Tarkir #165)
Vial Smasher, Gleeful Grenadier (Outlaws of Thunder Junction #235)
Vial Smasher the Fierce (Commander 2016 #49)
Vial Smasher the Fierce (Secret Lair Drop #1202)

The message was clear to Sorin—time to search for something else.