12 cards where the card is tagged “substance”

Armor of Thorns (Vintage Masters #194)
Grave Servitude (Mirage #126)
Lightning Reflexes (Dominaria Remastered #128)
Mystic Veil (Visions #38)
Necromancy (Murders at Karlov Manor Commander #131)
Parapet (Visions #14)
Relic Ward (Visions #16)
Soar (Mirage #93)
Spider Climb (Visions #120)
Thawing Glaciers (Vintage Masters #318)
Ward of Lights (Mirage #47)
Waylay (Urza's Saga #56)

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