Obelisk Spider 
Creature — Spider
$2.52 #4823 0.22 9.3 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%
$0.26↓#38620.34↑9.5 years
"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%
$0.17↓#12922↓0.33↑5.7 years↓
"At the beginning of your end step, each opponent loses 1 life and you gain 1 life."
Drana's Emissary85%
$0.34↓#6763↓0.06↓11.0 years↑
"At the beginning of your upkeep, each opponent loses 1 life and you gain 1 life."
Banewhip Punisher85%
$0.25↓#11192↓0.06↓9.3 years
"When this creature enters, you may put a -1/-1 counter on target creature."
Blowfly Infestation84%
$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."
Grief Tyrant83%
$0.15↓#26356↓0.06↓18.5 years↑
"This creature enters with four -1/-1 counters on it."
Agent of Masks82%
$0.14↓#17946↓0.2220.7 years↑
"At the beginning of your upkeep, each opponent loses 1 life. You gain life equal to the life lost this way."
Subversion82%
$1.92↓#17068↓0.00↓27.7 years↑
"At the beginning of your upkeep, each opponent loses 1 life. You gain life equal to the life lost this way."
Skirmish Rhino81%
$0.24↓#17215↓0.06↓1.5 years↓
"When this creature enters, each opponent loses 2 life and you gain 2 life."
Vampire Neonate81%
$0.13↓#15588↓0.06↓8.3 years
"
, 
: Each opponent loses 1 life and you gain 1 life."
, : Each opponent loses 1 life and you gain 1 life."
Lockjaw Snapper80%
$1.54↓#16140↓0.1818.5 years↑
"Wither"
Cultbrand Cinder80%
$0.11↓#30659↓0.00↓18.5 years↑
"When this creature enters, put a -1/-1 counter on target creature."
Skinrender80%
$0.23↓#56920.69↑16.1 years↑
"When this creature enters, put three -1/-1 counters on target creature."
Sneering Shadewriter80%
$0.12↓#20550↓0.08↓0.5 years↓
"When this creature enters, each opponent loses 2 life and you gain 2 life."
Auntie Ool, Cursewretch80%
$0.33↓#6208↓0.71↑0.7 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%
$0.22↓#6477↓0.00↓1.9 years↓
"Whenever this creature attacks, each opponent loses 1 life and you gain 1 life."
Retreat to Hagra79%
$0.54↓#2777↑0.1311.0 years↑
"• Each opponent loses 1 life and you gain 1 life."
Persistent Constrictor79%
$12.13↑#2790↑0.69↑2.1 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%
$0.14↓#11683↓0.292.5 years↓
"Whenever you commit a crime, each opponent loses 1 life and you gain 1 life. This ability triggers only once each turn."
Soulstinger78%
$0.18↓#20032↓0.189.5 years
"When this creature enters, put two -1/-1 counters on target creature you control."