Blowfly Infestation 
Enchantment
$0.37 #3092 0.29 18.3 years
Whenever a creature dies, if it had a -1/-1 counter on it, put a -1/-1 counter on target creature.
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Cards similar to Blowfly Infestation 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.
The Scorpion God88%
$0.29↓#5217↓0.08↓9.4 years↓
"Whenever a creature with a -1/-1 counter on it dies, draw a card."
Hapatra, Vizier of Poisons87%
$0.28↓#3936↓0.50↑9.4 years↓
"Whenever this card deals combat damage to a player, you may put a -1/-1 counter on target creature."
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."
Banewhip Punisher86%
$0.29↓#10977↓0.00↓9.1 years↓
"When this creature enters, you may put a -1/-1 counter on target creature."
Grief Tyrant85%
$0.16↓#25986↓0.42↑18.3 years
"When this creature dies, put a -1/-1 counter on target creature for each -1/-1 counter on this creature."
Obelisk Spider84%
$3.17↑#4844↓0.06↓9.1 years↓
"Whenever this creature deals combat damage to a creature, put a -1/-1 counter on that creature."
Scar84%
$0.23↓#19614↓0.2918.3 years
"Put a -1/-1 counter on target creature."
Lockjaw Snapper84%
$1.11↑#15839↓0.2918.3 years
"When this creature dies, put a -1/-1 counter on each creature with a -1/-1 counter on it."
Blight Rot83%
$0.25↓#9217↓0.00↓0.6 years↓
"Put four -1/-1 counters on target creature."
Crumbling Ashes82%
$27.70↑#6709↓0.79↑18.1 years
"At the beginning of your upkeep, destroy target creature with a -1/-1 counter on it."
Cultbrand Cinder82%
$0.11↓#30299↓0.00↓18.3 years
"When this creature enters, put a -1/-1 counter on target creature."
Skinrender82%
$0.17↓#5738↓0.40↑15.9 years↓
"When this creature enters, put three -1/-1 counters on target creature."
Soulstinger82%
$0.12↓#19695↓0.00↓9.4 years↓
"When this creature dies, you may put a -1/-1 counter on target creature for each -1/-1 counter on this creature."
Liliana, Death Wielder82%
$0.40↑#7954↓0.72↑9.4 years↓
"+2: Put a -1/-1 counter on up to one target creature."
Festering Mummy82%
$0.29↓#12529↓0.249.4 years↓
"When this creature dies, you may put a -1/-1 counter on target creature."
Spitting Dilophosaurus81%
$26.78↑#5609↓0.78↑2.8 years↓
"Whenever this creature enters or attacks, put a -1/-1 counter on up to one target creature."
Instill Infection80%
$0.11↓#23712↓0.07↓15.9 years↓
"Put a -1/-1 counter on target creature."
Grim Affliction80%
$0.31↓#4601↓0.3315.3 years↓
"Put a -1/-1 counter on target creature, then proliferate."
Weed-Pruner Poplar80%
$0.15↓#26274↓0.2918.6 years
"At the beginning of your upkeep, target creature other than this creature gets -1/-1 until end of turn."
Volrath, the Shapestealer79%
$0.68↑#13602↓0.50↑7.0 years↓
"At the beginning of combat on your turn, put a -1/-1 counter on up to one target creature."