Obelisk Spider 
Creature — Spider
$3.17 #4844 0.06 9.1 years
Reach
Whenever this creature deals combat damage to a creature, put a -1/-1 counter on that creature.
Whenever you put one or more -1/-1 counters on a creature, each opponent loses 1 life and you gain 1 life.
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Cards similar to Obelisk Spider 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.
Hapatra, Vizier of Poisons89%
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"Whenever this card deals combat damage to a player, you may put a -1/-1 counter on target creature."
+1 more matching line
Dogged Pursuit86%
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"At the beginning of your end step, each opponent loses 1 life and you gain 1 life."
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"At the beginning of your upkeep, each opponent loses 1 life and you gain 1 life."
Banewhip Punisher85%
$0.29↓#10977↓0.009.1 years
"When this creature enters, you may put a -1/-1 counter on target creature."
Blowfly Infestation84%
$0.37↓#3092↑0.29↑18.3 years↑
"Whenever a creature dies, if it had a -1/-1 counter on it, put a -1/-1 counter on target creature."
Grief Tyrant83%
$0.16↓#25986↓0.42↑18.3 years↑
"This creature enters with four -1/-1 counters on it."
Subversion82%
$2.15↓#16719↓0.0027.6 years↑
"At the beginning of your upkeep, each opponent loses 1 life. You gain life equal to the life lost this way."
Agent of Masks82%
$0.12↓#17800↓0.0720.6 years↑
"At the beginning of your upkeep, each opponent loses 1 life. You gain life equal to the life lost this way."
Skirmish Rhino81%
$0.23↓#17043↓0.16↑1.4 years↓
"When this creature enters, each opponent loses 2 life and you gain 2 life."
Vampire Neonate81%
$0.13↓#15398↓0.008.1 years
"
, 
: Each opponent loses 1 life and you gain 1 life."
, : Each opponent loses 1 life and you gain 1 life."
Lockjaw Snapper80%
$1.11↓#15839↓0.29↑18.3 years↑
"Wither"
Silverquill Charm80%
$0.21↓#11988↓0.000.4 years↓
"• Each opponent loses 3 life and you gain 3 life."
Cultbrand Cinder80%
$0.11↓#30299↓0.0018.3 years↑
"When this creature enters, put a -1/-1 counter on target creature."
Skinrender80%
$0.17↓#57380.40↑15.9 years↑
"When this creature enters, put three -1/-1 counters on target creature."
Sneering Shadewriter80%
$0.13↓#21076↓0.000.4 years↓
"When this creature enters, each opponent loses 2 life and you gain 2 life."
+1 more matching line
Auntie Ool, Cursewretch80%
$0.33↓#6420↓0.000.6 years↓
"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."
Sanguine Syphoner80%
$0.19↓#6561↓0.111.8 years↓
"Whenever this creature attacks, each opponent loses 1 life and you gain 1 life."
Retreat to Hagra79%
$0.61↓#2731↑0.23↑10.9 years↑
"• Each opponent loses 1 life and you gain 1 life."
Persistent Constrictor79%
$12.50↑#2708↑0.34↑1.9 years↓
"At the beginning of each opponent's upkeep, they lose 1 life and you put a -1/-1 counter on up to one target creature they control."
Raven of Fell Omens78%
$0.20↓#11457↓0.062.4 years↓
"Whenever you commit a crime, each opponent loses 1 life and you gain 1 life. This ability triggers only once each turn."