Spireside Infiltrator 
Creature — Human Rogue
$0.11 #23100 0.00 10.1 years
Whenever this creature becomes tapped, it deals 1 damage to each opponent.
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Cards similar to Spireside Infiltrator 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.
Hawkeye's Bow93%
$0.29↑#10630↑0.40↑0.3 years↓
"Whenever equipped creature becomes tapped, it deals 1 damage to each opponent."
Zhur-Taa Druid88%
$0.19↑#4257↑0.15↑13.5 years↑
"Whenever you tap this creature for mana, it deals 1 damage to each opponent."
Manabarbs87%
$4.42↑#2300↑1.34↑33.2 years↑
"Whenever a player taps a land for mana, this enchantment deals 1 damage to that player."
Panicked Altisaur85%
$0.16↑#14077↑0.33↑2.9 years↓
"
: This creature deals 2 damage to each opponent."
: This creature deals 2 damage to each opponent."
Insolence84%
$0.09↓#29529↓0.11↑25.7 years↑
"Whenever enchanted creature becomes tapped, this Aura deals 2 damage to that creature's controller."
Psychic Venom84%
$0.13↑#246070.0733.2 years↑
"Whenever enchanted land becomes tapped, this Aura deals 2 damage to that land's controller."
Lasting Tarfire82%
$0.24↑#6199↑0.14↑0.7 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."
Goblin Medics82%
$0.13↑#187820.0527.7 years↑
"Whenever this creature becomes tapped, it deals 1 damage to any target."
Night Market Lookout80%
$0.17↑#13146↑0.0010.1 years
"Whenever this creature becomes tapped, each opponent loses 1 life and you gain 1 life."
Haunting Wind79%
$15.12↑#258520.50↑32.6 years↑
"Whenever an artifact becomes tapped or a player activates an artifact's ability without in its activation cost, this enchantment deals 1 damage to that artifact's controller."
in its activation cost, this enchantment deals 1 damage to that artifact's controller."
Glassworks // Shattered Yard79%
$0.15↑#9462↑0.11↑2.1 years↓
"At the beginning of your end step, this Room deals 1 damage to each opponent."
Breath of Malfegor78%
$0.18↑#13956↑0.12↑17.5 years↑
"this card deals 5 damage to each opponent."
Sizzle78%
$0.21↑#15982↑0.0627.0 years↑
"this card deals 3 damage to each opponent."
Storm Caller78%
$0.12↑#222730.006.3 years↓
"When this creature enters, it deals 2 damage to each opponent."
Welder Automaton78%
$0.06↓#247140.009.7 years
"
: This creature deals 1 damage to each opponent."
: This creature deals 1 damage to each opponent."
Shivan Gorge78%
$1.04↑#2490↑0.0828.0 years↑
", : this card deals 1 damage to each opponent."
, : this card deals 1 damage to each opponent."
Teapot Slinger77%
$0.26↑#9019↑0.062.2 years↓
"Whenever you expend 4, this creature deals 2 damage to each opponent."
Wildfire Awakener76%
$3.13↑#6339↑0.003.5 years↓
"When this creature enters, create X 1/1 red Elemental creature tokens with "Whenever this token becomes tapped, it deals 1 damage to target player.""
Tunneling Geopede76%
$0.33↑#4918↑0.27↑11.0 years
"Whenever a land you control enters, this creature deals 1 damage to each opponent."
Spitfire Lagac76%
$0.16↑#3917↑0.27↑6.1 years↓
"Whenever a land you control enters, this creature deals 1 damage to each opponent."