Viral Spawning 
Sorcery
$0.22 #16752 0.27 3.7 years
Create a 3/3 green Phyrexian Beast creature token with toxic 1. (Players dealt combat damage by it also get a poison counter.)
Corrupted — As long as an opponent has three or more poison counters and this card is in your graveyard, it has flashback . (You may cast this card from your graveyard for its flashback cost. Then exile it.)
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Cards similar to Viral Spawning expected a card that isn't here?
Reports become test cases the matcher is graded against before an update ships. Delvefall isn't a chatbot guessing, it compares the printed rules text of every card with plain math, and examples like yours decide which differences should count.
Wurmquake86%
$0.37↑#141200.213.7 years
"Create an X/X green Phyrexian Wurm creature token with trample and toxic 1, where X is the amount of mana spent to cast this spell. Then for each opponent with three or more poison counters, you create another one of those tokens."
Goliath Hatchery86%
$0.31↑#153010.59↑3.7 years
"When this enchantment enters, create two 3/3 green Phyrexian Beast creature tokens with toxic 1."
Venomous Brutalizer84%
$0.29↑#7918↑0.333.7 years
"Toxic 3"
Blightbelly Rat80%
$0.26↑#2797↑0.313.7 years
"Toxic 1"
Vishgraz, the Doomhive80%
$1.41↑#6863↑0.53↑3.7 years
"When this card enters, create three 1/1 colorless Phyrexian Mite artifact creature tokens with toxic 1 and "This token can't block.""
+1 more matching line
Branchblight Stalker79%
$0.24↑#13387↑0.16↓3.7 years
"Toxic 2"
Bilious Skulldweller79%
$0.35↑#4562↑0.09↓3.7 years
"Toxic 1"
Ichorspit Basilisk79%
$0.26↑#8276↑0.283.7 years
"Toxic 1"
Jawbone Duelist79%
$0.29↑#10081↑0.00↓3.7 years
"Toxic 1"
Bloated Contaminator79%
$3.23↑#2623↑0.65↑3.7 years
"Toxic 1"
Sheoldred's Headcleaver78%
$0.16↓#147530.41↑3.7 years
"Toxic 2"
Pestilent Syphoner78%
$0.32↑#6608↑0.203.7 years
"Toxic 1"
Tyrranax Atrocity78%
$0.27↑#11863↑0.74↑3.7 years
"Toxic 3"
Skrelv's Hive76%
$0.37↑#1904↑0.45↑3.7 years
"At the beginning of your upkeep, you lose 1 life and create a 1/1 colorless Phyrexian Mite artifact creature token with toxic 1 and "This token can't block.""
Phyrexian Swarmlord76%
$3.27↑#5055↑0.62↑15.4 years↑
"At the beginning of your upkeep, create a 1/1 green Phyrexian Insect creature token with infect for each poison counter your opponents have."
Mycosynth Fiend76%
$0.14↓#193150.3315.4 years↑
"This creature gets +1/+1 for each poison counter your opponents have."
Beast Attack75%
$0.15↓#27670↓0.00↓25.1 years↑
"Create a 4/4 green Beast creature token."
Glissa's Retriever74%
$0.43↑#9768↑0.293.7 years
"Haste, toxic 3"
Septic Rats74%
$0.61↑#10376↑0.50↑15.7 years↑
"Whenever this creature attacks, if defending player is poisoned, it gets +1/+1 until end of turn."
Roar of the Wurm74%
$0.28↑#195980.2725.1 years↑
"Create a 6/6 green Wurm creature token."