16 cards where the set is “war” and the text includes “proliferate”

Bloom Hulk (War of the Spark #154)
Contentious Plan (War of the Spark #46)
Courage in Crisis (War of the Spark #158)
Evolution Sage (War of the Spark #159)
Flux Channeler (War of the Spark #52)
Grateful Apparition (War of the Spark #17)
Guildpact Informant (War of the Spark #271)
Huatli's Raptor (War of the Spark #200)
Karn's Bastion (War of the Spark #248)
Kiora's Dambreaker (War of the Spark #58)
Martyr for the Cause (War of the Spark #23)
Merfolk Skydiver (War of the Spark #205)
Planewide Celebration (War of the Spark #172)
Pollenbright Druid (War of the Spark #173)
Roalesk, Apex Hybrid (War of the Spark #213)
Wanderer's Strike (War of the Spark #38)

The arc of my blade has carved a path of light to the end of these results.