Nazar, the Velvet Fang 

Legendary Creature — Vampire Warlock
$0.23 #16646 0.10 1.9 years
Menace (This creature can't be blocked except by two or more creatures.)
Whenever you gain life, put a feeding counter on Nazar.
Whenever Nazar attacks, you may remove three feeding counters from it. If you do, you draw three cards and you lose 3 life.
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Cards similar to Nazar, the Velvet Fang 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.
Moonglove Extractor88%
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"Whenever this creature attacks, you draw a card and you lose 1 life."
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Comforting Counsel78%
$0.25↑#10315↑0.120.5 years↓
"Whenever you gain life, put a growth counter on this enchantment."
Two-Headed Hellkite78%
$6.91↑#4851↑0.32↑4.1 years↑
"Whenever this creature attacks, draw two cards."
Savanti Romero, Time's Exile78%
$0.27↑#140480.21↑0.6 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."
Stinging Cave Crawler78%
$0.24↑#11932↑0.00↓2.9 years
"Descend 4 — Whenever this creature attacks, if there are four or more permanent cards in your graveyard, you draw a card and you lose 1 life."
Stocking the Pantry78%
$0.30↑#3746↑0.102.2 years
"Whenever you put one or more +1/+1 counters on a creature you control, put a supply counter on this enchantment."
Pious Kitsune77%
$0.10↓#21883↓0.25↑22.1 years↑
"
, Remove a devotion counter from this creature: You gain 1 life."
Fetid Gargantua76%
$0.18↓#155940.122.3 years
"Whenever one or more +1/+1 counters are put on this creature, you may draw two cards. If you do, you lose 2 life."
Exemplar of Light76%
$0.91↑#1124↑0.32↑1.9 years
"Whenever you gain life, put a +1/+1 counter on this creature."
+1 more matching line
Seymour Flux76%
$0.22↓#12587↑0.161.4 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."