Spawn of Mayhem 
Creature — Demon
$0.55 #10653 0.25 7.6 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 Pendulum89%
$0.53↓#30186↓0.2429.9 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 Acrobat86%
$0.12↓#28445↓0.187.6 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 Slum86%
$0.25↓#26639↓0.79↑20.6 years↑
"At the beginning of your upkeep, this creature deals 1 damage to each player."
Blade Juggler82%
$0.06↓#23227↓0.317.6 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 Tablet82%
$56.45↑#15363↓0.11↓33.1 years↑
"At the beginning of each player's upkeep, this artifact deals 1 damage to that player."
Ob Nixilis, Captive Kingpin82%
$15.93↑#4439↑0.76↑3.3 years↓
"Flying, trample"
Savage Gorger80%
$0.19↓#23180↓0.15↓7.2 years
"At the beginning of your end step, if an opponent lost life this turn, put a +1/+1 counter on this creature."
Dead Revels80%
$0.14↓#18699↓0.317.6 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 Stage80%
$0.26↓#1220↑0.13↓7.6 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."
Hackrobat78%
$0.05↓#25719↓0.04↓7.6 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%
$0.20↓#5043↑0.197.6 years
"
: This creature deals 1 damage to each player."
: This creature deals 1 damage to each player."
Body Count78%
$3.10↑#7957↑0.274.4 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."
Drill Bit77%
$0.21↓#23234↓0.50↑7.6 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 Critics77%
$0.20↓#90380.00↓7.6 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 Demon76%
$0.06↓#25668↓0.07↓7.6 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."
Blood Tyrant76%
$0.34↓#14910↓0.06↓17.6 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
Barbed Wire76%
$1.77↑#13458↓0.40↑26.9 years↑
"At the beginning of each player's upkeep, this artifact deals 1 damage to that player."
Flame Rift74%
$0.32↓#3984↑0.2026.6 years↑
"this card deals 4 damage to each player."
Lasting Tarfire74%
$0.25↓#6536↑0.00↓0.6 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."
Impatience74%
$0.29↓#22786↓0.3127.2 years↑
"At the beginning of each player's end step, if that player didn't cast a spell this turn, this enchantment deals 2 damage to that player."