Thunderwolf Cavalry 

Creature — Astartes Warrior
$0.35 #15634 0.00 4.0 years
First strike
Crushing Teeth — Whenever this creature deals combat damage to a player, put a +1/+1 counter on each other creature you control.
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Cards similar to Thunderwolf Cavalry 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.
Borborygmos95%
$0.38↑#173080.24↑20.7 years↑
"Whenever this card deals combat damage to a player, put a +1/+1 counter on each creature you control."
Drana, Liberator of Malakir92%
$1.10↑#1550↑0.18↑11.0 years↑
"Whenever this card deals combat damage to a player, put a +1/+1 counter on each attacking creature you control."
+1 more matching line
Markov Blademaster87%
$0.31↓#135680.0014.7 years↑
"Whenever this creature deals combat damage to a player, put a +1/+1 counter on it."
+1 more matching line
Slith Predator87%
$0.11↓#29138↓0.0023.0 years↑
"Whenever this creature deals combat damage to a player, put a +1/+1 counter on it."
Slith Firewalker87%
$0.16↓#28345↓0.11↑23.0 years↑
"Whenever this creature deals combat damage to a player, put a +1/+1 counter on it."
Erdwal Ripper87%
$0.20↓#25789↓0.0714.7 years↑
"Whenever this creature deals combat damage to a player, put a +1/+1 counter on it."
Stromkirk Patrol87%
$0.05↓#27692↓0.12↑15.1 years↑
"Whenever this creature deals combat damage to a player, put a +1/+1 counter on it."
Falkenrath Marauders86%
$0.26↓#162740.0015.1 years↑
"Whenever this creature deals combat damage to a player, put two +1/+1 counters on it."
Heirs of Stromkirk86%
$0.11↓#24144↓0.38↑14.5 years↑
"Whenever this creature deals combat damage to a player, put a +1/+1 counter on it."
Slith Ascendant86%
$0.07↓#25371↓0.0023.0 years↑
"Whenever this creature deals combat damage to a player, put a +1/+1 counter on it."
Wakka, Devoted Guardian86%
$0.23↓#4978↑0.24↑1.4 years↓
"At the beginning of your end step, if a counter was put on this card this turn, put a +1/+1 counter on each other creature you control."
Havengul Vampire85%
$0.13↓#21584↓0.19↑14.5 years↑
"Whenever this creature deals combat damage to a player, put a +1/+1 counter on it."
Slith Bloodletter82%
$0.10↓#29909↓0.0023.0 years↑
"Whenever this creature deals combat damage to a player, put a +1/+1 counter on it."
Vorosh, the Hunter82%
$0.85↑#19939↓0.24↑19.7 years↑
"Whenever this card deals combat damage to a player, you may pay 
. If you do, put six +1/+1 counters on this card."
Victory's Envoy82%
$0.32↓#10210↑0.44↑6.7 years↑
"At the beginning of your upkeep, put a +1/+1 counter on each other creature you control."
Bloodcrazed Neonate81%
$0.09↓#22879↓0.0015.1 years↑
"Whenever this creature deals combat damage to a player, put a +1/+1 counter on it."
Guild Thief81%
$0.06↓#23214↓0.005.2 years↑
"Whenever this creature deals combat damage to a player, put a +1/+1 counter on it."
Briar Hydra81%
$0.31↓#130700.13↑4.1 years
"Whenever this creature deals combat damage to a player, put X +1/+1 counters on target creature you control, where X is the number of basic land types among lands you control."
Necropolis Regent80%
$0.44↑#4135↑0.19↑14.0 years↑
"Whenever a creature you control deals combat damage to a player, put that many +1/+1 counters on it."