Chekov and McCoy 
Legendary Creature — Human Pilot Doctor
$4.61 #31800 0.0 years
Whenever you put one or more +1/+1 counters on Chekov and McCoy, you may draw that many cards. Do this only once each turn.
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Cards similar to Chekov and McCoy 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.
Terrasymbiosis98%
$8.18↑#739↑0.601.3 years↑
"Whenever you put one or more +1/+1 counters on a creature you control, you may draw that many cards. Do this only once each turn."
Dusk Legion Duelist93%
$1.59↓#2697↑0.113.6 years↑
"Whenever one or more +1/+1 counters are put on this creature, draw a card. This ability triggers only once each turn."
Armorcraft Judge90%
$0.16↓#3692↑0.1710.1 years↑
"When this creature enters, draw a card for each creature you control with a +1/+1 counter on it."
Mind Unbound87%
$0.44↓#14282↑0.3915.3 years↑
"At the beginning of your upkeep, put a lore counter on this enchantment, then draw a card for each lore counter on this enchantment."
Kes, Evolving Telepath86%
$1.17↓#294010.0 years
"At the beginning of your end step, put a time counter on this card, then draw X cards, where X is the number of time counters on her. Then if she has nine or more time counters on her, sacrifice her."
Meltstrider Eulogist86%
$0.25↓#7831↑0.111.3 years↑
"Whenever a creature you control with a +1/+1 counter on it dies, draw a card."
Exemplar of Light86%
$0.96↓#1088↑0.322.0 years↑
"Whenever you put one or more +1/+1 counters on this creature, draw a card. This ability triggers only once each turn."
Fetid Gargantua86%
$0.23↓#15773↑0.122.4 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."
Deepwood Denizen86%
$0.24↓#10610↑0.005.4 years↑
"
, 
: Draw a card. This ability costs 
less to activate for each +1/+1 counter on creatures you control."
, : Draw a card. This ability costs less to activate for each +1/+1 counter on creatures you control."
Fathom Mage84%
$0.29↓#1717↑0.2413.8 years↑
"Whenever a +1/+1 counter is put on this creature, you may draw a card."
Pensive Professor84%
$0.38↓#4965↑0.180.6 years
"Whenever one or more +1/+1 counters are put on this creature, draw a card."
Bred for the Hunt84%
$0.27↓#2682↑0.2013.5 years↑
"Whenever a creature you control with a +1/+1 counter on it deals combat damage to a player, you may draw a card."
Savanti Romero, Time's Exile84%
$0.29↓#13817↑0.210.7 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."
Walking Archive82%
$2.94↓#12652↑0.3520.5 years↑
"At the beginning of each player's upkeep, that player draws a card for each +1/+1 counter on this creature."
April O'Neil, Hacktivist82%
$0.24↓#17145↑0.180.7 years
"At the beginning of your end step, draw a card for each card type among spells you've cast this turn."
Insight Engine81%
$1.33↓#2255↑0.231.3 years↑
"
, : Put a charge counter on this artifact, then draw a card for each charge counter on it."
, : Put a charge counter on this artifact, then draw a card for each charge counter on it."
Skyclave Shadowcat80%
$0.24↓#15088↑0.406.1 years↑
"Whenever a creature you control with a +1/+1 counter on it dies, draw a card."
Mikey & Leo, Chaos & Order80%
$1.47↓#6856↑0.230.7 years
"Whenever you put a counter on a creature you control, draw a card. This ability triggers only once each turn."
Marketback Walker80%
$0.37↓#3932↑0.231.7 years↑
"When this creature dies, draw a card for each +1/+1 counter on it."
Voracious Bibliophile78%
$0.33↓#7538↑0.001.6 years↑
"Whenever you cast a spell with one or more targets, draw that many cards."