Lightmine Field 
Enchantment
$5.79 #11223 0.53 16.4 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.
Caltrops89%
$20.53↑#5428↑0.33↓27.2 years↑
"Whenever a creature attacks, this artifact deals 1 damage to it."
Circle of Flame86%
$0.16↓#92660.33↓15.1 years↓
"Whenever a creature without flying attacks you or a planeswalker you control, this enchantment deals 1 damage to that creature."
Barbed Foliage80%
$0.17↓#28370↓0.00↓29.9 years↑
"Whenever a creature without flying attacks you, this enchantment deals 1 damage to it."
Orim's Prayer80%
$0.52↓#17874↓0.12↓28.9 years↑
"Whenever one or more creatures attack you, you gain 1 life for each attacking creature."
Raking Canopy79%
$1.72↓#16552↓0.35↓18.3 years↑
"Whenever a creature with flying attacks you, this enchantment deals 4 damage to it."
Rain of Blades78%
$0.05↓#26647↓0.00↓23.3 years↑
"this card deals 1 damage to each attacking creature."
Sandstorm78%
$0.10↓#23242↓0.5732.7 years↑
"this card deals 1 damage to each attacking creature."
Hissing Miasma78%
$2.52↓#98430.24↓20.6 years↑
"Whenever a creature attacks you, its controller loses 1 life."
Kazuul, Tyrant of the Cliffs77%
$0.18↓#1867↑0.29↓16.6 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%
$0.39↓#19359↓0.37↓25.3 years↑
"Whenever a creature attacks or blocks, this enchantment deals 2 damage to it."
Blood Reckoning76%
$0.30↓#122390.6214.1 years↓
"Whenever a creature attacks you or a planeswalker you control, that creature's controller loses 1 life."
Divine Retribution75%
$0.66↓#30798↓0.24↓29.9 years↑
"this card deals damage to target attacking creature equal to the number of attacking creatures."
Kongming's Contraptions75%
$36.41↑#30774↓0.5027.3 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%
$5.30↓#162↑1.07↑21.9 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%
$14.25↑#6765↑1.10↑25.9 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%
$0.81↓#7110↑0.05↓10.0 years↓
"Whenever a creature attacks you or a planeswalker you control, that creature's controller loses 1 life."
Scorching Winds72%
$0.29↓#29426↓0.05↓29.3 years↑
"this card deals 1 damage to each attacking creature."
Sarkhan the Masterless72%
$0.39↓#5749↑0.12↓7.3 years↓
"Whenever a creature attacks you or a planeswalker you control, each Dragon you control deals 1 damage to that creature."
Lava Storm72%
$0.14↓#29256↓0.24↓29.2 years↑
"this card deals 2 damage to each attacking creature or this card deals 2 damage to each blocking creature."
Brigid, Hero of Kinsbaile72%
$6.67↑#13573↓0.40↓18.9 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."