Lightmine Field 
Enchantment
$5.76 #11336 0.44 16.5 years
Whenever one or more creatures attack, this enchantment deals damage to each of those creatures equal to the number of attacking creatures.
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Cards similar to Lightmine Field 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.
Caltrops88%
$15.53↑#5347↑0.31↓27.4 years↑
"Whenever a creature attacks, this artifact deals 1 damage to it."
Circle of Flame86%
$0.17↓#95430.27↓15.3 years↓
"Whenever a creature without flying attacks you or a planeswalker you control, this enchantment deals 1 damage to that creature."
Barbed Foliage80%
$0.16↓#28684↓0.06↓30.0 years↑
"Whenever a creature without flying attacks you, this enchantment deals 1 damage to it."
Orim's Prayer80%
$0.53↓#17960↓0.21↓29.0 years↑
"Whenever one or more creatures attack you, you gain 1 life for each attacking creature."
Raking Canopy79%
$1.54↓#16994↓0.07↓18.5 years↑
"Whenever a creature with flying attacks you, this enchantment deals 4 damage to it."
Rain of Blades78%
$0.06↓#27007↓0.06↓23.4 years↑
"this card deals 1 damage to each attacking creature."
Sandstorm78%
$0.11↓#23422↓0.00↓32.8 years↑
"this card deals 1 damage to each attacking creature."
Hissing Miasma78%
$1.91↓#100690.19↓20.7 years↑
"Whenever a creature attacks you, its controller loses 1 life."
Kazuul, Tyrant of the Cliffs77%
$0.16↓#1890↑0.22↓16.7 years
"Whenever a creature an opponent controls attacks, if you're the defending player, create a 3/3 red Ogre creature token unless that creature's controller pays 
."
."
Powerstone Minefield76%
$0.40↓#19559↓0.59↑25.4 years↑
"Whenever a creature attacks or blocks, this enchantment deals 2 damage to it."
Blood Reckoning76%
$0.28↓#124620.31↓14.3 years↓
"Whenever a creature attacks you or a planeswalker you control, that creature's controller loses 1 life."
Divine Retribution75%
$0.64↓#30999↓0.29↓30.0 years↑
"this card deals damage to target attacking creature equal to the number of attacking creatures."
Kongming's Contraptions75%
$36.41↑#30980↓0.07↓27.5 years↑
"
: This creature deals 2 damage to target attacking creature. Activate only during the declare attackers step and only if you've been attacked this step."
: This creature deals 2 damage to target attacking creature. Activate only during the declare attackers step and only if you've been attacked this step."
Ghostly Prison74%
$5.67↓#159↑1.29↑22.1 years↑
"Creatures can't attack you unless their controller pays for each creature they control that's attacking you."
for each creature they control that's attacking you."
Collective Restraint74%
$12.03↑#6827↑0.99↑26.0 years↑
"Creatures can't attack you unless their controller pays 
for each creature they control that's attacking you, where X is the number of basic land types among lands you control."
for each creature they control that's attacking you, where X is the number of basic land types among lands you control."
Marchesa's Decree74%
$0.26↓#6998↑0.11↓10.1 years↓
"Whenever a creature attacks you or a planeswalker you control, that creature's controller loses 1 life."
Scorching Winds72%
$0.27↓#29821↓0.06↓29.5 years↑
"this card deals 1 damage to each attacking creature."
Sarkhan the Masterless72%
$0.43↓#5687↑0.14↓7.5 years↓
"Whenever a creature attacks you or a planeswalker you control, each Dragon you control deals 1 damage to that creature."
Lava Storm72%
$0.15↓#29570↓0.06↓29.4 years↑
"this card deals 2 damage to each attacking creature or this card deals 2 damage to each blocking creature."
Brigid, Hero of Kinsbaile72%
$6.15↑#13712↓0.00↓19.0 years↑
": this card deals 2 damage to each attacking or blocking creature target player controls."
: this card deals 2 damage to each attacking or blocking creature target player controls."