Auntie Ool, Cursewretch 
Legendary Creature — Goblin Warlock
$0.33 #6208 0.71 0.7 years
Ward—Blight 2. (To blight 2, a player puts two -1/-1 counters on a creature they control.)
Whenever one or more -1/-1 counters are put on a creature, draw a card if you control that creature. If you don't control it, its controller loses 1 life.
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Cards similar to Auntie Ool, Cursewretch 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.
The Scorpion God80%
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"Whenever a creature with a -1/-1 counter on it dies, draw a card."
Obelisk Spider80%
$2.52↑#4823↑0.22↓9.3 years↑
"Whenever you put one or more -1/-1 counters on a creature, each opponent loses 1 life and you gain 1 life."
Valgavoth, Harrower of Souls75%
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"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."
Blowfly Infestation73%
$0.33#3048↑0.59↓18.5 years↑
"Whenever a creature dies, if it had a -1/-1 counter on it, put a -1/-1 counter on target creature."
Lockjaw Snapper72%
$1.54↑#16140↓0.18↓18.5 years↑
"Wither"
Banewhip Punisher72%
$0.25↓#11192↓0.06↓9.3 years↑
"When this creature enters, you may put a -1/-1 counter on target creature."
Hapatra, Vizier of Poisons71%
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"Whenever you put one or more -1/-1 counters on a creature, create a 1/1 green Snake creature token with deathtouch."
Flourishing Defenses70%
$0.47↑#3834↑0.50↓18.5 years↑
"Whenever a -1/-1 counter is put on a creature, you may create a 1/1 green Elf Warrior creature token."
Nest of Scarabs70%
$3.09↑#3497↑0.27↓9.5 years↑
"Whenever you put one or more -1/-1 counters on a creature, create that many 1/1 black Insect creature tokens."
Grief Tyrant70%
$0.15↓#26356↓0.06↓18.5 years↑
"This creature enters with four -1/-1 counters on it."