Lion Vulture 

Creature — Cat Bird
$0.25 #18986 0.00 0.8 years
Flying (This creature can't be blocked except by creatures with flying or reach.)
At the beginning of your end step, if an opponent lost life this turn, put a +1/+1 counter on this creature and draw a card. (Damage causes loss of life.)
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Cards similar to Lion Vulture 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.
Valgavoth, Harrower of Souls94%
$20.79↑#2208↑0.76↑1.9 years↑
"Whenever an opponent loses life for the first time during each of their turns, put a +1/+1 counter on this card and draw a card."
+1 more matching line
Savage Gorger93%
$0.19↓#23180↓0.15↑7.2 years↑
"At the beginning of your end step, if an opponent lost life this turn, put a +1/+1 counter on this creature."
Sygg, River Cutthroat92%
$4.28↑#3809↑0.29↑18.3 years↑
"At the beginning of each end step, if an opponent lost 3 or more life this turn, you may draw a card."
Frilled Sparkshooter88%
$0.17↓#14065↑0.20↑2.1 years↑
"This creature enters with a +1/+1 counter on it if an opponent lost life this turn."
Mounted Dreadknight88%
$0.07↓#22973↓0.27↑4.9 years↑
"This creature enters with a +1/+1 counter on it if an opponent lost life this turn."
Seymour Flux85%
$0.24↓#12740↑0.31↑1.2 years
"At the beginning of your upkeep, you may pay 1 life. If you do, draw a card and put a +1/+1 counter on this card."
Feast on the Fallen82%
$0.18↓#11263↑0.0012.1 years↑
"At the beginning of each upkeep, if an opponent lost life last turn, put a +1/+1 counter on target creature you control."
Ludevic, Necro-Alchemist82%
$1.37↑#13901↑0.24↑9.8 years↑
"At the beginning of each player's end step, that player may draw a card if a player other than you lost life this turn."
Sphinx of Magosi82%
$0.10↓#167090.27↑16.4 years↑
"
: Draw a card, then put a +1/+1 counter on this creature."
Knight of the Ebon Legion81%
$1.43↑#4864↑0.14↑7.2 years↑
"At the beginning of your end step, if a player lost 4 or more life this turn, put a +1/+1 counter on this creature."
Cindering Cutthroat80%
$0.15↓#13047↑0.41↑2.1 years↑
"This creature enters with a +1/+1 counter on it if an opponent lost life this turn."
Savanti Romero, Time's Exile80%
$0.28↑#14483↑0.000.5 years
"At the beginning of combat on your turn, put a +1/+1 counter on this card. Then you draw X cards and lose X life, where X is the number of counters on this card."