Defiant Greatmaw 
Creature — Hippo
$0.17 #22038 0.00 9.5 years
When this creature enters, put two -1/-1 counters on target creature you control.
Whenever you put one or more -1/-1 counters on this creature, remove a -1/-1 counter from another target creature you control.
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Cards similar to Defiant Greatmaw 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.
Ornery Kudu95%
$0.11↓#29999↓0.009.5 years
"When this creature enters, put a -1/-1 counter on target creature you control."
Crocodile of the Crossing95%
$0.08↓#263320.009.5 years
"When this creature enters, put a -1/-1 counter on target creature you control."
Baleful Ammit92%
$0.24↑#201370.12↑9.5 years
"When this creature enters, put a -1/-1 counter on target creature you control."
Soulstinger92%
$0.18↑#200320.18↑9.5 years
"When this creature enters, put two -1/-1 counters on target creature you control."
+1 more matching line
Exemplar of Strength92%
$0.19↑#247590.009.5 years
"When this creature enters, put three -1/-1 counters on target creature you control."
+1 more matching line
Channeler Initiate92%
$0.15↓#5784↑0.069.5 years
"When this creature enters, put three -1/-1 counters on target creature you control."
Decimator Beetle90%
$0.08↓#187330.11↑9.5 years
"When this creature enters, put a -1/-1 counter on target creature you control."
+1 more matching line
Heartmender89%
$1.08↑#248860.0018.5 years↑
"At the beginning of your upkeep, remove a -1/-1 counter from each creature you control."
Plague Belcher84%
$0.37↑#3625↑0.12↑9.5 years
"When this creature enters, put two -1/-1 counters on target creature you control."
Chainbreaker84%
$0.24↑#190170.40↑18.5 years↑
"This creature enters with two -1/-1 counters on it."
+1 more matching line
Scarscale Ritual82%
$0.10↓#249530.25↑18.5 years↑
"As an additional cost to cast this spell, put a -1/-1 counter on a creature you control."
Manticore of the Gauntlet81%
$0.03↓#30682↓0.16↑9.5 years
"When this creature enters, put a -1/-1 counter on target creature you control. This creature deals 3 damage to target opponent or planeswalker."
Lethal Sting78%
$0.21↑#189370.25↑9.3 years
"As an additional cost to cast this spell, put a -1/-1 counter on a creature you control."
Shed Weakness78%
$0.05↓#27456↓0.009.5 years
"Target creature gets +2/+2 until end of turn. You may remove a -1/-1 counter from it."
Noxious Hatchling78%
$0.38↑#203520.21↑18.2 years↑
"This creature enters with four -1/-1 counters on it."
+1 more matching line
Banewhip Punisher77%
$0.25↑#11192↑0.069.3 years
"When this creature enters, you may put a -1/-1 counter on target creature."
Lichenthrope76%
$0.59↑#29221↓0.0029.7 years↑
"At the beginning of your upkeep, remove a -1/-1 counter from this creature."
Magmaroth76%
$0.07↓#29663↓0.009.3 years
"At the beginning of your upkeep, put a -1/-1 counter on this creature."
Reluctant Dounguard76%
$0.07↓#225820.030.7 years↓
"This creature enters with two -1/-1 counters on it."
+1 more matching line
Belligerent Hatchling76%
$0.16↓#28780↓0.0018.2 years↑
"This creature enters with four -1/-1 counters on it."
+1 more matching line