Drawing a card anytime one of your nontoken creatures dies may seem like a pittance of a deal where you're only cantripping repeatedly, but when you have creatures and effects that allow you to get creatures back from the graveyard repeatedly, this gets out of control quickly
If the first card you draw in a turn is a card with miracle, you can immediately reveal it
Infect had its own issues, and I do think poison will return one day, so maybe poisonous will get another chance

Swampwalk Creature (28) 1x Anurid Murkdiver 1x Blistergrub 1x Bog Raiders 1x Bog Serpent 1x Bog Smugglers 1x Bog Tatters 1x Bog Wraith 1x Cateran Slaver 1x Corpse Harvester 1x Cyclopean Giant 1x Dirtwater Wraith 1x Dross Golem 1x Fendeep Summoner 1x Filth 1x Guul Draz Overseer 1x Infernal Denizen 1x Liliana's Shade 1x Lost Soul 1x Magus of the Coffers 1x Moor Fiend 1x Nightmare 1x Paragon of Open Graves 1x Plague Beetle 1x Quag Vampires 1x Restless Bones 1x Squelching Leeches 1x Urborg Shambler 1x Whispering Shade Planeswalker (1) Land (46) Enchantment (8) 1x Bad Moon 1x Blanket of Night 1x Contaminated Ground 1x Evil Presence 1x Genju of the Fens 1x Leshrac's Rite 1x Quag Sickness 1x Tainted Well Artifact (3) Instant (4) Sorcery (9) 1x Bubbling Muck 1x Choking Sands 1x Corrupt 1x Dregs of Sorrow 1x Infernal Harvest 1x Mind Sludge 1x Mire's Toll 1x Nighthaze 1x Nightmare Incursion
Pithing Needle seems really well positioned at the moment, which is a big help
How about doubling up tokens created by Docent of Perfection, Talrand or Inalla