Scourge of the Skyclaves 
Creature — Demon
$0.53 #11670 0.71 5.9 years
Kicker 
When you cast this spell, if it was kicked, each player loses half their life, rounded up.
Scourge of the Skyclaves's power and toughness are each equal to 20 minus the highest life total among players.
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Cards similar to Scourge of the Skyclaves 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.
Dire Fleet Ravager88%
$0.25↓#6422↑0.29↓8.9 years↑
"When this creature enters, each player loses a third of their life, rounded up."
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$0.32↓#8441↑0.6213.9 years↑
"At the beginning of each player's upkeep, that player loses half their life, rounded up."
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$5.48↑#7304↑0.7514.3 years↑
"this card's power and toughness are each equal to half the highest life total among your opponents, rounded up."
Heartless Hidetsugu78%
$2.87↑#3038↑0.97↑21.6 years↑
"
: this card deals damage to each player equal to half that player's life total, rounded down."
: this card deals damage to each player equal to half that player's life total, rounded down."
Serra Avatar75%
$0.45↓#7780↑0.6927.9 years↑
"this card's power and toughness are each equal to your life total."
Roiling Horror74%
$0.40↓#26838↓0.31↓19.6 years↑
"this card's power and toughness are each equal to your life total minus the life total of an opponent with the most life."
Ancient Ooze74%
$1.48↑#15579↓0.52↓23.3 years↑
"this card's power and toughness are each equal to the total mana value of other creatures you control."
Ebonblade Reaper74%
$5.58↑#98220.22↓23.9 years↑
"Whenever this creature attacks, you lose half your life, rounded up."
Territorial Maro74%
$0.10↓#24245↓0.00↓4.0 years↓
"this card's power and toughness are each equal to twice the number of basic land types among lands you control."
Mwonvuli Ooze73%
$0.75↑#26221↓0.00↓29.2 years↑
"this card's power and toughness are each equal to 1 plus twice the number of age counters on it."
Temporal Extortion73%
$19.97↑#6451↑0.27↓19.6 years↑
"When you cast this spell, any player may pay half their life, rounded up. If a player does, counter this card."
Matca Rioters73%
$0.10↓#28969↓0.05↓17.6 years↑
"this card's power and toughness are each equal to the number of basic land types among lands you control."
Rusting Golem72%
$0.23↓#30776↓0.25↓26.6 years↑
"this card's power and toughness are each equal to the number of fade counters on it."
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$0.32↓#101610.11↓5.8 years
"this card's power and toughness are each equal to your life total."
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"this card's power and toughness are each equal to the number of time counters on it."
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"When this creature dies, its owner loses half their life, rounded up."
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"this card's power and toughness are each equal to twice the number of cards in your hand."
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$0.70↑#442↑0.59↓15.6 years↑
"this card's power and toughness are each equal to the number of cards in your hand."
+1 more matching line
Burrowguard Mentor70%
$0.27↓#6580↑0.17↓2.1 years↓
"this card's power and toughness are each equal to the number of creatures you control."
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"this card's power and toughness are each equal to the number of creatures you control."