Angel's Trumpet 
Artifact
$0.50 #8723 0.52 27.6 years
All creatures have vigilance.
At the beginning of each player's end step, tap all untapped creatures that player controls that didn't attack this turn. This artifact deals damage to the player equal to the number of creatures tapped this way.
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Cards similar to Angel's Trumpet 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.
Citadel of Pain90%
$4.17↑#6667↑1.11↑26.3 years↓
"At the beginning of each player's end step, this enchantment deals X damage to that player, where X is the number of untapped lands they control."
Kratos, God of War87%
$48.29↑#6195↑0.00↓0.9 years↓
"At the beginning of each player's end step, this card deals damage to that player equal to the number of creatures that player controls that didn't attack this turn."
Power Surge84%
$1.11↑#11497↓0.4333.1 years↑
"At the beginning of each player's upkeep, this enchantment deals X damage to that player, where X is the number of untapped lands they controlled at the beginning of this turn."
Antagonism78%
$0.41↓#25473↓0.10↓27.9 years
"At the beginning of each player's end step, this enchantment deals 2 damage to that player unless one of their opponents was dealt damage this turn."
Impatience77%
$0.29↓#22786↓0.31↓27.2 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."
Aang, Air Nomad76%
$0.31↓#12037↓0.00↓0.8 years↓
"Other creatures you control have vigilance."
Serra's Guardian76%
$0.37↓#90990.38↓8.1 years↓
"Other creatures you control have vigilance."
Serra's Blessing75%
$1.07↑#12055↓0.29↓29.2 years↑
"Creatures you control have vigilance."
Mask of Intolerance73%
$0.28↓#30292↓0.5025.3 years↓
"At the beginning of each player's upkeep, if there are four or more basic land types among lands that player controls, this artifact deals 3 damage to that player."
Copper Tablet72%
$56.45↑#15363↓0.11↓33.1 years↑
"At the beginning of each player's upkeep, this artifact deals 1 damage to that player."
Synchronous Sliver72%
$0.35↓#17251↓0.11↓19.6 years↓
"All Sliver creatures have vigilance."
Monsoon72%
$0.96↑#27022↓0.6031.3 years↑
"At the beginning of each player's end step, tap all untapped Islands that player controls and this enchantment deals X damage to the player, where X is the number of Islands tapped this way."
Loxodon Sergeant72%
$0.14↓#25625↓0.42↓7.3 years↓
"When this creature enters, other creatures you control gain vigilance until end of turn."
Dormant Grove // Gnarled Grovestrider71%
$0.30↓#96920.16↓4.8 years↓
"Other creatures you control have vigilance."
Inquisitor Greyfax70%
$0.35↓#98540.06↓3.9 years↓
"Other creatures you control get +1/+0 and have vigilance."
Ancient Runes70%
$1.40↑#14467↓0.35↓28.9 years↑
"At the beginning of each player's upkeep, this enchantment deals damage to that player equal to the number of artifacts they control."
Spectral Gateguards70%
$0.10↓#28342↓0.00↓14.3 years↓
"As long as this creature is paired with another creature, both creatures have vigilance."
Akroma's Devoted70%
$0.19↓#21775↓0.36↓23.6 years↓
"Cleric creatures have vigilance."