15 cards where the card is in the spellbook for “contagion dispenser”

Bloom Hulk (War of the Spark #154)
Cankerbloom (Phyrexia: All Will Be One #161)
Contagion Clasp (Duel Decks: Mirrodin Pure vs. New Phyrexia #67)
Contagion Engine (Scars of Mirrodin #145)
Contentious Plan (War of the Spark #46)
Evolution Sage (The Lost Caverns of Ixalan Commander #240)
Flux Channeler (Commander Masters #847)
Inexorable Tide (Modern Masters 2015 #49)
Merfolk Skydiver (The Lost Caverns of Ixalan Commander #277)
Pollenbright Druid (Commander Masters #312)
Roalesk, Apex Hybrid (New Capenna Commander #349)
Smell Fear (Modern Horizons 2 #173)
Sword of Truth and Justice (Modern Horizons #229)
Tezzeret's Gambit (Outlaws of Thunder Junction Commander #117)
Thrummingbird (Commander Masters #858)

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