Rakdos Afflict Zombies will make your enemies suffer (Standard)

Official russian translation of afflict mechanic is "suffering", I don't know why. But that's what we're gonna make enemies do. The creatures aren't too expensive to cast and they can deal damage constantly whenever the enemy blocks them or not. Thanks to Wildfire Eternal trigger ability we can cast any sorcery or instant for free, it can be Star of Extinction, it can be Hazoret's Undying Fury, it can be Fiery Lashes or Hungry Flames. Inferno Jet is very good card because it can deal 6 damage to the opponent for free and it cycles for 2 mana. Another good combo - if we have Ammit Eternal or Plague Belcher at the table and are going to attack with Wildfire Eternal - use Insult, then if Wildfire Eternal isn't blocked play Consuming Fervor on one of these heavy creatures and then and Fling it - 17 damage right in their faces FOR TURN. but - rulings say that we can't delay this on second main phase, we must cast it right after the trigger. Ammit Eternal is great combo with Plague Belcher if you cast Ammit Eternal first, you don't really care about these -1/-1 counters because Ammit Eternal removes them on attack anyway, also Consuming Fervor is incredible buff for Ammit Eternal. Since all the creatures are zombies Lord of the Accursed comes quite in handy. You get +1/+1 on each zombie you control and we have 28 zombies in our deck. Khenra Eternal is very good second drop since it has afflict. When we play Neheb, The Eternal we gain incredible amount of mana with which we can use Fling on creatures like Ammit Eternal 5/5, Plague Belcher 5/4 after we already attacked with, which is not a big loss for 5 damage right in their faces. Crash Through is pretty good buff for our heavy creatures to deal even more damage, but if you want you can replace it with Invigorated Rampage. Insult // Injury is just very good card for afflict deck, but there's one big issue about it: afflict is not a damage. It means we can't power it up with Insult, it is said in rulings, that afflict is just enemy losing HP, but it can't be regarded as damage, so be careful about cards like Haze of Pollen. You might consider playing Invigorated Rampage instead of Crash Through.
About sideboard - you might want to swap Khenra Eternal with Earthshaker Khenra, but the cons - Earthshaker Khenra is not zombie, so you definetely need mountain in opening hand because Unclaimed Territories should be set on zombies, same trouble with Combat Celebrant.
If you want to upgrade it - Canyon Slough, Abrade/Fatal Push, Vraska's Contempt.