Grim Affliction 
Instant
$0.31 #4601 0.33 15.3 years
Put a -1/-1 counter on target creature, then proliferate. (Choose any number of permanents and/or players, then give each another counter of each kind already there.)
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Cards similar to Grim Affliction expected a card that isn't here?
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Scar95%
$0.23↓#19614↓0.2918.3 years↑
"Put a -1/-1 counter on target creature."
Blight Rot94%
$0.25↓#9217↓0.00↓0.6 years↓
"Put four -1/-1 counters on target creature."
Instill Infection92%
$0.11↓#23712↓0.07↓15.9 years
"Put a -1/-1 counter on target creature."
Skinrender92%
$0.17↓#5738↓0.4015.9 years
"When this creature enters, put three -1/-1 counters on target creature."
Cultbrand Cinder92%
$0.11↓#30299↓0.00↓18.3 years↑
"When this creature enters, put a -1/-1 counter on target creature."
Drown in Ichor90%
$0.77↑#2072↑0.13↓3.6 years↓
"Target creature gets -4/-4 until end of turn. Proliferate."
Splendid Agony88%
$0.14↓#15059↓0.00↓9.4 years↓
"Distribute two -1/-1 counters among one or two target creatures."
Gnarled Effigy86%
$0.18↓#27488↓0.2418.3 years↑
"
, 
: Put a -1/-1 counter on target creature."
, : Put a -1/-1 counter on target creature."
Puncture Bolt86%
$0.20↓#23333↓0.2518.3 years↑
"this card deals 1 damage to target creature. Put a -1/-1 counter on that creature."
Whisper of the Dross85%
$0.37↑#37200.303.6 years↓
"Target creature gets -1/-1 until end of turn. Proliferate."
Fume Spitter85%
$0.18↓#10859↓0.05↓15.9 years
"Sacrifice this creature: Put a -1/-1 counter on target creature."
Festering Mummy84%
$0.29↓#12529↓0.249.4 years↓
"When this creature dies, you may put a -1/-1 counter on target creature."
Contagion Clasp84%
$0.34↑#1420↑0.3616.0 years
"When this artifact enters, put a -1/-1 counter on target creature."
Death Wind84%
$0.07↓#17164↓0.56↑14.3 years
"Target creature gets -X/-X until end of turn."
Eyes of the Beholder84%
$0.17↓#21301↓0.13↓5.1 years↓
"Target creature gets -11/-11 until end of turn."
Banewhip Punisher84%
$0.29↓#10977↓0.00↓9.1 years↓
"When this creature enters, you may put a -1/-1 counter on target creature."
Serrated Biskelion84%
$0.13↓#20026↓0.00↓29.2 years↑
": Put a -1/-1 counter on this creature and a -1/-1 counter on target creature."
: Put a -1/-1 counter on this creature and a -1/-1 counter on target creature."
Stinging Shot84%
$0.17↓#22367↓0.06↓9.4 years↓
"Put three -1/-1 counters on target creature with flying."
Wring Flesh84%
$0.06↓#27726↓0.00↓15.1 years
"Target creature gets -3/-1 until end of turn."
Fatal Fumes84%
$0.02↓#29371↓0.00↓13.3 years↓
"Target creature gets -4/-2 until end of turn."