Mycosynth Fiend 
Creature — Phyrexian Horror
$0.14 #18973 0.14 15.3 years
This creature gets +1/+1 for each poison counter your opponents have.
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Vishgraz, the Doomhive90%
$1.41↑#6782↑0.72↑3.6 years↓
"this card gets +1/+1 for each poison counter your opponents have."
Distorted Curiosity86%
$0.21↑#11403↑0.53↑3.6 years↓
"This spell costs less to cast if an opponent has three or more poison counters."
less to cast if an opponent has three or more poison counters."
Apostle of Invasion84%
$0.13↓#184380.36↑3.6 years↓
"As long as an opponent has three or more poison counters, this creature has double strike."
Incisor Glider82%
$0.11↓#196810.223.6 years↓
"Whenever this creature attacks, if an opponent has three or more poison counters, creatures you control get +1/+1 until end of turn."
Septic Rats80%
$0.47↑#10815↑0.65↑15.6 years
"Whenever this creature attacks, if defending player is poisoned, it gets +1/+1 until end of turn."
Viridian Betrayers77%
$0.21↑#217400.50↑15.3 years
"This creature has infect as long as an opponent is poisoned."
Phyrexian Swarmlord77%
$2.90↑#4945↑0.70↑15.3 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."
Viral Spawning76%
$0.22↑#164910.29↑3.6 years↓
"As long as an opponent has three or more poison counters and this card is in your graveyard, it has flashback ."
."
Feed the Infection74%
$0.32↑#10460↑0.42↑3.6 years↓
"Each opponent who has three or more poison counters loses 3 life."
Chained Throatseeker74%
$0.15↑#213410.38↑15.3 years
"This creature can't attack unless defending player is poisoned."
Phyresis Outbreak72%
$11.54↑#3738↑0.73↑3.6 years↓
"Each opponent gets a poison counter. Then each creature your opponents control gets -1/-1 until end of turn for each poison counter its controller has."