9 cards where the illustration contains “mortar”

Apothecary Geist (Shadows over Innistrad #4)
Collateral Damage (Fate Reforged #95)
Ertai's Familiar (Weatherlight #38)
Goblin Masons (Urza's Destiny #86)
Lambholt Elder // Silverpelt Werewolf (Dark Ascension #122)
Lambholt Elder // Silverpelt Werewolf (Dark Ascension #122)
Puffer Extract (Mercadian Masques #310)
Pyrotechnics (Fate Reforged #111)
Rogue's Gloves (Magic 2015 #227)
Zada, Hedron Grinder (Battle for Zendikar #162)

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