Nazar, the Velvet Fang 

Legendary Creature — Vampire Warlock
$0.30 #16636 0.12 1.8 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.
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Comforting Counsel78%
$0.30#11149↑0.00↓0.4 years↓
"Whenever you gain life, put a growth counter on this enchantment."
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, Remove a devotion counter from this creature: You gain 1 life."
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Exemplar of Light76%
$0.75↑#1245↑0.31↑1.8 years
"Whenever you gain life, put a +1/+1 counter on this creature."
+1 more matching line
Seymour Flux76%
$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."
Savanti Romero, Time's Exile76%
$0.28↓#144830.00↓0.5 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."