Spawn of Mayhem 
Creature — Demon
$0.52 #10907 0.19 7.7 years
Spectacle 
(You may cast this spell for its spectacle cost rather than its mana cost if an opponent lost life this turn.)
(You may cast this spell for its spectacle cost rather than its mana cost if an opponent lost life this turn.)Flying, trample
At the beginning of your upkeep, this creature deals 1 damage to each player. Then if you have 10 or less life, put a +1/+1 counter on this creature.
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Cards similar to Spawn of Mayhem 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.
Razor Pendulum88%
$0.55↑#30471↓0.05↓30.0 years↑
"At the beginning of each player's end step, if that player has 5 or less life, this artifact deals 2 damage to that player."
Spikewheel Acrobat88%
$0.14↓#28725↓0.00↓7.7 years
"Spectacle 
You may cast this spell for its spectacle cost rather than its mana cost if an opponent lost life this turn."
You may cast this spell for its spectacle cost rather than its mana cost if an opponent lost life this turn."
Rumbling Slum84%
$0.25↓#27068↓0.06↓20.7 years↑
"At the beginning of your upkeep, this creature deals 1 damage to each player."
Blade Juggler84%
$0.09↓#23558↓0.00↓7.7 years
"Spectacle You may cast this spell for its spectacle cost rather than its mana cost if an opponent lost life this turn."
You may cast this spell for its spectacle cost rather than its mana cost if an opponent lost life this turn."
Dead Revels82%
$0.15↓#18872↓0.07↓7.7 years
"Spectacle You may cast this spell for its spectacle cost rather than its mana cost if an opponent lost life this turn."
You may cast this spell for its spectacle cost rather than its mana cost if an opponent lost life this turn."
Light Up the Stage82%
$0.29↓#1242↑0.07↓7.7 years
"Spectacle You may cast this spell for its spectacle cost rather than its mana cost if an opponent lost life this turn."
You may cast this spell for its spectacle cost rather than its mana cost if an opponent lost life this turn."
Copper Tablet80%
$56.19↑#15887↓0.2533.2 years↑
"At the beginning of each player's upkeep, this artifact deals 1 damage to that player."
Hackrobat80%
$0.05↓#25845↓0.127.7 years
"Spectacle You may cast this spell for its spectacle cost rather than its mana cost if an opponent lost life this turn."
You may cast this spell for its spectacle cost rather than its mana cost if an opponent lost life this turn."
Ob Nixilis, Captive Kingpin80%
$14.80↑#4506↑0.65↑3.4 years↓
"Flying, trample"
Body Count80%
$3.36↑#8073↑0.174.5 years↓
"Spectacle You may cast this spell for its spectacle cost rather than its mana cost if an opponent lost life this turn."
You may cast this spell for its spectacle cost rather than its mana cost if an opponent lost life this turn."
Savage Gorger80%
$0.19↓#23494↓0.00↓7.3 years
"At the beginning of your end step, if an opponent lost life this turn, put a +1/+1 counter on this creature."
Drill Bit79%
$0.20↓#23541↓0.137.7 years
"Spectacle You may cast this spell for its spectacle cost rather than its mana cost if an opponent lost life this turn."
You may cast this spell for its spectacle cost rather than its mana cost if an opponent lost life this turn."
Rafter Demon79%
$0.08↓#26004↓0.00↓7.7 years
"Spectacle 
You may cast this spell for its spectacle cost rather than its mana cost if an opponent lost life this turn."
You may cast this spell for its spectacle cost rather than its mana cost if an opponent lost life this turn."
Skewer the Critics79%
$0.19↓#92960.127.7 years
"Spectacle You may cast this spell for its spectacle cost rather than its mana cost if an opponent lost life this turn."
You may cast this spell for its spectacle cost rather than its mana cost if an opponent lost life this turn."
Spear Spewer78%
$0.18↓#5207↑0.197.7 years
"
: This creature deals 1 damage to each player."
: This creature deals 1 damage to each player."
Barbed Wire75%
$1.36↑#13927↓0.1727.0 years↑
"At the beginning of each player's upkeep, this artifact deals 1 damage to that player."
Blood Tyrant74%
$0.36↓#15177↓0.40↑17.7 years↑
"At the beginning of your upkeep, each player loses 1 life. Put a +1/+1 counter on this creature for each 1 life lost this way."
+1 more matching line
Herdchaser Dragon74%
$0.28↓#22432↓0.07↓11.6 years↑
"Flying, trample"
Flame Rift74%
$0.33↓#4030↑0.2826.7 years↑
"this card deals 4 damage to each player."
Lasting Tarfire73%
$0.24↓#6199↑0.140.7 years↓
"At the beginning of each end step, if you put a counter on a creature this turn, this enchantment deals 2 damage to each opponent."