Lightning Reaver 
Creature — Zombie Beast
$0.58 #20342 0.71 17.3 years
Haste; fear (This creature can't be blocked except by artifact creatures and/or black creatures.)
Whenever this creature deals combat damage to a player, put a charge counter on it.
At the beginning of your end step, this creature deals damage equal to the number of charge counters on it to each opponent.
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Cards similar to Lightning Reaver 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.
Lasting Tarfire91%
$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."
Sizzle84%
$0.21↓#15625↑0.16↓26.9 years↑
"this card deals 3 damage to each opponent."
Breath of Malfegor84%
$0.17↓#13677↑0.00↓17.3 years
"this card deals 5 damage to each opponent."
Storm Caller82%
$0.11↓#219940.07↓6.2 years↓
"When this creature enters, it deals 2 damage to each opponent."
Panicked Altisaur79%
$0.18↓#13639↑0.07↓2.8 years↓
"
: This creature deals 2 damage to each opponent."
: This creature deals 2 damage to each opponent."
Bhaal's Invoker78%
$0.27↓#11836↑0.00↓4.2 years↓
"
: This creature deals 4 damage to each opponent."
: This creature deals 4 damage to each opponent."
Thrummingbird78%
$0.25↓#845↑0.22↓15.9 years↓
"Whenever this creature deals combat damage to a player, proliferate."
Malignant Growth77%
$0.54↓#28267↓0.35↓29.9 years↑
"At the beginning of each opponent's draw step, that player draws an additional card for each growth counter on this enchantment, then this enchantment deals damage to the player equal to the number of cards they drew this way."
Banshee's Blade77%
$0.28↓#16044↑0.09↓22.9 years↑
"Whenever equipped creature deals combat damage, put a charge counter on this Equipment."
Glassworks // Shattered Yard76%
$0.20↓#8782↑0.19↓1.9 years↓
"At the beginning of your end step, this Room deals 1 damage to each opponent."
Lavacore Elemental76%
$0.14↓#27309↓0.29↓19.6 years↑
"Whenever a creature you control deals combat damage to a player, put a time counter on this creature."
Yuan-Ti Fang-Blade76%
$0.17↓#13493↑0.27↓5.1 years↓
"Whenever this creature deals combat damage to a player, venture into the dungeon."
Shortcut Seeker76%
$0.20↓#15776↑0.17↓5.1 years↓
"Whenever this creature deals combat damage to a player, venture into the dungeon."
Merfolk Spy76%
$0.23↓#188220.05↓16.1 years↓
"Whenever this creature deals combat damage to a player, that player reveals a card at random from their hand."
Diseased Vermin76%
$0.34↓#236090.07↓30.2 years↑
"Whenever this creature deals combat damage to a player, put an infection counter on it."
+1 more matching line
Teapot Slinger76%
$0.20↓#8697↑0.29↓2.1 years↓
"Whenever you expend 4, this creature deals 2 damage to each opponent."
Herald of Ilharg75%
$3.66↑#11555↑0.24↓2.5 years↓
"Whenever you cast a creature spell, put two +1/+1 counters on this creature. If that spell has mana value 5 or greater, this creature deals damage equal to the number of counters on it to each opponent."
Vorosh, the Hunter74%
$0.73↑#195880.41↓19.6 years↑
"Whenever this card deals combat damage to a player, you may pay 
. If you do, put six +1/+1 counters on this card."
. If you do, put six +1/+1 counters on this card."
Viseling74%
$0.35↓#10596↑0.53↓26.6 years↑
"At the beginning of each opponent's upkeep, this creature deals X damage to that player, where X is the number of cards in their hand minus 4."
Precinct Captain74%
$0.24↓#11137↑0.25↓13.9 years↓
"Whenever this creature deals combat damage to a player, create a 1/1 white Soldier creature token."