Sephiroth, Planet's Heir 
Legendary Creature — Human Avatar Soldier
$0.44 #10885 0.60 1.4 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.
Massacre Wurm98%
$1.94↑#514↑0.88↑15.7 years↑
"When this creature enters, creatures your opponents control get -2/-2 until end of turn."
+1 more matching line
Malakir Cullblade96%
$0.15↓#16415↓0.47↓11.3 years↑
"Whenever a creature an opponent controls dies, put a +1/+1 counter on this creature."
Slaughter Specialist90%
$0.88↑#4703↑0.30↓5.1 years↑
"Whenever a creature an opponent controls dies, put a +1/+1 counter on this creature."
Make Obsolete87%
$0.14↓#15749↓0.22↓10.1 years↑
"Creatures your opponents control get -1/-1 until end of turn."
Cower in Fear87%
$0.15↓#16060↓0.05↓14.3 years↑
"Creatures your opponents control get -1/-1 until end of turn."
Yahenni, Undying Partisan86%
$0.28↓#1036↑0.33↓9.7 years↑
"Whenever a creature an opponent controls dies, put a +1/+1 counter on this card."
Plague Mare86%
$0.28↓#16023↓0.13↓8.3 years↑
"When this creature enters, creatures your opponents control get -1/-1 until end of turn."
Arms of Hadar86%
$0.53↑#20694↓0.25↓4.4 years↑
"Creatures target player controls get -2/-2 until end of turn."
Fire Nation Sentinels86%
$0.37↓#16298↓0.22↓0.9 years
"Whenever a nontoken creature an opponent controls dies, put a +1/+1 counter on each creature you control."
Sarulf, Realm Eater86%
$0.32↓#105511.06↑5.7 years↑
"Whenever a permanent an opponent controls is put into a graveyard from the battlefield, put a +1/+1 counter on this card."
Night Clubber86%
$0.28↓#14238↓0.20↓4.5 years↑
"When this creature enters, creatures your opponents control get -1/-1 until end of turn."
The Meathook Massacre86%
$24.81↑#516↑1.08↑5.1 years↑
"When this card enters, each creature gets -X/-X until end of turn."
+1 more matching line
Foundry Hornet84%
$0.21↓#25736↓0.06↓9.7 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%
$0.22↓#94990.503.3 years↑
"Whenever a creature an opponent controls dies, put a +1/+1 counter on this card."
Minister of Pain84%
$0.07↓#26587↓0.11↓11.6 years↑
"When this creature exploits a creature, creatures your opponents control get -1/-1 until end of turn."
Kraven the Hunter83%
$0.25↓#14158↓0.28↓1.1 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."
Rockslide Elemental82%
$0.17↓#24393↓0.18↓18.0 years↑
"Whenever another creature dies, you may put a +1/+1 counter on this creature."
Archfiend of Sorrows82%
$0.12↓#15229↓0.47↓5.3 years↑
"When this creature enters, creatures your opponents control get -2/-2 until end of turn."
Suffocating Fumes82%
$0.20↓#15331↓0.06↓6.5 years↑
"Creatures your opponents control get -1/-1 until end of turn."
Seeker's Folly82%
$0.12↓#14351↓0.28↓1.9 years
"• Creatures your opponents control get -1/-1 until end of turn."