52 cards where the set is “one” and the text includes “toxic”

Annex Sentry (ONE)
Basilica Shepherd (ONE)
Charge of the Mites (ONE)
Compleat Devotion (ONE)
Crawling Chorus (ONE)
Duelist of Deep Faith (ONE)
Flensing Raptor (ONE)
Indoctrination Attendant (ONE)
Infested Fleshcutter (ONE)
Jawbone Duelist (ONE)
Porcelain Zealot (ONE)
Skrelv, Defector Mite (ONE)
Skrelv's Hive (ONE)
White Sun's Twilight (ONE)
Aspirant's Ascent (ONE)
Unctus's Retrofitter (ONE)
Bilious Skulldweller (ONE)
Blightbelly Rat (ONE)
Karumonix, the Rat King (ONE)
Necrogen Communion (ONE)
Nimraiser Paladin (ONE)
Pestilent Syphoner (ONE)
Sheoldred's Headcleaver (ONE)
Stinging Hivemaster (ONE)
Hexgold Slash (ONE)
Bloated Contaminator (ONE)
Branchblight Stalker (ONE)
Ichorspit Basilisk (ONE)
Maze's Mantle (ONE)
Paladin of Predation (ONE)
Plague Nurse (ONE)
Tyrranax Atrocity (ONE)
Tyrranax Rex (ONE)
Venerated Rotpriest (ONE)
Venomous Brutalizer (ONE)
Viral Spawning (ONE)
Lukka, Bound to Ruin (ONE)
Necrogen Rotpriest (ONE)
Ria Ivor, Bane of Bladehold (ONE)
Slaughter Singer (ONE)
Tainted Observer (ONE)
Venser, Corpse Puppet (ONE)
Voidwing Hybrid (ONE)
Dune Mover (ONE)
Monument to Perfection (ONE)
Myr Convert (ONE)
Prosthetic Injector (ONE)
Ribskiff (ONE)
Mirrex (ONE)
Mite Overseer (ONE)
Kinzu of the Bleak Coven (ONE)
Goliath Hatchery (ONE)

This search is finished. Now the real work can begin.