Sephiroth, Planet's Heir 
Legendary Creature — Human Avatar Soldier
$0.63 #10981 0.55 1.2 years
Vigilance (Attacking doesn't cause this creature to tap.)
When Sephiroth enters, creatures your opponents control get -2/-2 until end of turn.
Whenever a creature an opponent controls dies, put a +1/+1 counter on Sephiroth.
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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.
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"When this creature enters, creatures your opponents control get -2/-2 until end of turn."
+1 more matching line
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"Whenever a creature an opponent controls dies, put a +1/+1 counter on this creature."
Cower in Fear90%
$0.14↓#15508↓0.16↓14.1 years↑
"Creatures your opponents control get -1/-1 until end of turn."
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$0.12↓#15167↓0.12↓9.9 years↑
"Creatures your opponents control get -1/-1 until end of turn."
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"Whenever a creature an opponent controls dies, put a +1/+1 counter on this card."
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"When this creature enters, creatures your opponents control get -1/-1 until end of turn."
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$0.29↓#15489↓0.37↓8.1 years↑
"When this creature enters, creatures your opponents control get -1/-1 until end of turn."
Arms of Hadar86%
$0.44↓#20205↓0.40↓4.2 years↑
"Creatures target player controls get -2/-2 until end of turn."
Sarulf, Realm Eater86%
$0.33↓#107410.38↓5.6 years↑
"Whenever a permanent an opponent controls is put into a graveyard from the battlefield, put a +1/+1 counter on this card."
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$0.25↓#25395↓0.33↓9.6 years↑
"When this creature enters, if you control a creature with a +1/+1 counter on it, creatures your opponents control get -1/-1 until end of turn."
Legolas, Counter of Kills84%
$0.21↓#94200.21↓3.2 years↑
"Whenever a creature an opponent controls dies, put a +1/+1 counter on this card."
Fire Nation Sentinels84%
$0.47↓#16449↓0.00↓0.8 years
"Whenever a nontoken creature an opponent controls dies, put a +1/+1 counter on each creature you control."
Minister of Pain84%
$0.13↓#26067↓0.07↓11.4 years↑
"When this creature exploits a creature, creatures your opponents control get -1/-1 until end of turn."
Kraven the Hunter84%
$0.25↓#14297↓0.471.0 years
"Whenever a creature an opponent controls with the greatest power among creatures that player controls dies, draw a card and put a +1/+1 counter on this card."
Suffocating Fumes83%
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"Creatures your opponents control get -1/-1 until end of turn."
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"Whenever a creature dies, put a +1/+1 counter on this creature."
Algae Gharial82%
$0.13↓#21915↓0.05↓17.9 years↑
"Whenever another creature dies, you may put a +1/+1 counter on this creature."
Rockslide Elemental82%
$0.15↓#23966↓0.4717.9 years↑
"Whenever another creature dies, you may put a +1/+1 counter on this creature."
Big Bertha82%
$0.28↓#24155↓0.00↓0.2 years↓
"Vigilance"