28 cards where the illustration contains “rust”

Abrupt Decay (Return to Ravnica #141)
Artifact Mutation (New Capenna Commander #326)
Battered Golem (Fifth Dawn #106)
Corrosion (Visions #128)
Darksteel Myr (Scars of Mirrodin #151)
Encrust (Magic 2013 #49)
Falkenrath Torturer (Dark Ascension #60)
Ferrous Lake (Fallout #148)
Golgari Thug (Ravnica: City of Guilds #87)
Granulate (Fifth Dawn #67)
Intrepid Hero (Urza's Saga #19)
Kami of Restless Shadows (Kamigawa: Neon Dynasty #104)
Krosan Grip (Friday Night Magic 2010 #8)
Masticore (From the Vault: Relics #7)
Myr Welder (Mirrodin Besieged #118)
Oathsworn Knight (Throne of Eldraine #98)
Rusted Slasher (Mirrodin Besieged #128)
Rust Elemental (Mirrodin #234)
Rust Monster (Adventures in the Forgotten Realms #161)
Rustspore Ram (Mirrodin #235)
Rust Tick (Scars of Mirrodin #198)
Spreading Algae (Urza's Saga #274)
Stasis (Magic Online Promos #65648)
Sunpetal Grove (Fallout #297)
Sunscorched Divide (Fallout #153)
Timetwister (Limited Edition Alpha #84)
Viridian Corrupter (Mirrodin Besieged #94)
Wear Away (Champions of Kamigawa #250)

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