37 cards where the card is tagged “synergy-poison”

Anoint with Affliction (Phyrexia: All Will Be One #81)
Apostle of Invasion (Phyrexia: All Will Be One #3)
Blightwing Whelp (Alchemy: Phyrexia #8)
Bonepicker Skirge (Phyrexia: All Will Be One #86)
Bring the Ending (Phyrexia: All Will Be One #44)
Chained Throatseeker (New Phyrexia #30)
Chittering Skitterling (Phyrexia: All Will Be One #87)
Contaminant Grafter (Phyrexia: All Will Be One Commander #17)
Corrupted Resolve (New Phyrexia #32)
Distorted Curiosity (Phyrexia: All Will Be One #46)
Feed the Infection (Phyrexia: All Will Be One #93)
Fleshless Gladiator (Phyrexia: All Will Be One #94)
Geth's Summons (Phyrexia: All Will Be One Commander #11)
Glissa's Retriever (Phyrexia: All Will Be One Commander #18)
Glistening Sphere (Phyrexia: All Will Be One Commander #20)
Goliath Hatchery (Phyrexia: All Will Be One #408)
Incisor Glider (Phyrexia: All Will Be One #15)
Ixhel, Scion of Atraxa (Phyrexia: All Will Be One Commander #1)
Mycosynth Fiend (New Phyrexia #117)
Nettling Host (Alchemy: Phyrexia #3)
Norn's Decree (Phyrexia: All Will Be One Commander #9)
Norn's Fetchling (Alchemy: Phyrexia #4)
Phyresis Outbreak (Phyrexia: All Will Be One Commander #12)
Phyrexian Atlas (Phyrexia: All Will Be One #237)
Phyrexian Swarmlord (New Phyrexia #119)
Ravenous Necrotitan (Phyrexia: All Will Be One #106)
Septic Rats (Mirrodin Besieged #55)
Sinew Dancer (Phyrexia: All Will Be One #32)
Skrelv's Hive (Phyrexia: All Will Be One #34)
The Seedcore (Phyrexia: All Will Be One #259)
Viral Spawning (Phyrexia: All Will Be One #194)
Viridian Betrayers (New Phyrexia #124)
Vishgraz, the Doomhive (Phyrexia: All Will Be One Commander #4)
Vivisection Evangelist (Phyrexia: All Will Be One #220)
Whispering Specter (New Phyrexia #77)
Wurmquake (Phyrexia: All Will Be One Commander #19)
Zealot's Conviction (Phyrexia: All Will Be One #39)

Though this query has ended, its relics still slumber in New Argive.