Dusk Legion Duelist 

Creature — Vampire Soldier
Vigilance
Whenever one or more +1/+1 counters are put on this creature, draw a card. This ability triggers only once each turn.
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Cards that do something similar 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.
Pensive Professor 100%
$0.48#7431
"Whenever one or more +1/+1 counters are put on this creature, draw a card."
Exemplar of Light 99%
$0.34#1300
"Whenever you put one or more +1/+1 counters on this creature, draw a card. This ability triggers only once each turn."
Kianne, Corrupted Memory 82%
$0.56#10835
"Whenever you draw a card, put a +1/+1 counter on this card."
The Astonishing Ant-Man 82%
$0.42#15760
"Whenever you draw a card, put a +1/+1 counter on this card."
Toothy, Imaginary Friend 82%
$8.40#5112
"Whenever you draw a card, put a +1/+1 counter on this card."
Baxter, Fly in the Ointment 82%
$0.31#8503
"Whenever you draw a card, put a +1/+1 counter on this card."
Cloaked Cadet 82%
$0.17#18585
"Whenever one or more +1/+1 counters are put on one or more Humans you control, draw a card. This ability triggers only once each turn."
Bred for the Hunt 80%
$0.50#2662
"Whenever a creature you control with a +1/+1 counter on it deals combat damage to a player, you may draw a card."