Ayara's Oathsworn 
Creature — Human Knight
$0.30 #7396 0.07 3.4 years
Menace
Whenever this creature deals combat damage to a player, if it has fewer than four +1/+1 counters on it, put a +1/+1 counter on it. Then if it has exactly four +1/+1 counters on it, search your library for a card, put it into your hand, then shuffle.
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Cards similar to Ayara's Oathsworn 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.
Heirs of Stromkirk83%
$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 Ascendant83%
$0.07↓#25371↓0.0023.0 years↑
"Whenever this creature deals combat damage to a player, put a +1/+1 counter on it."
Falkenrath Marauders83%
$0.26↓#16274↓0.0015.1 years↑
"Whenever this creature deals combat damage to a player, put two +1/+1 counters on it."
Grim Servant82%
$0.29↓#4006↑0.17↑2.3 years↓
"Menace"
Slith Predator82%
$0.11↓#29138↓0.0023.0 years↑
"Whenever this creature deals combat damage to a player, put a +1/+1 counter on it."
Slith Firewalker82%
$0.16↓#28345↓0.1123.0 years↑
"Whenever this creature deals combat damage to a player, put a +1/+1 counter on it."
Stromkirk Patrol82%
$0.05↓#27692↓0.1215.1 years↑
"Whenever this creature deals combat damage to a player, put a +1/+1 counter on it."
Markov Blademaster82%
$0.31↑#13568↓0.0014.7 years↑
"Whenever this creature deals combat damage to a player, put a +1/+1 counter on it."
Erdwal Ripper82%
$0.20↓#25789↓0.0714.7 years↑
"Whenever this creature deals combat damage to a player, put a +1/+1 counter on it."
Falkenrath Exterminator81%
$0.13↓#18457↓0.0014.5 years↑
"Whenever this creature deals combat damage to a player, put a +1/+1 counter on it."
Havengul Vampire80%
$0.13↓#21584↓0.19↑14.5 years↑
"Whenever this creature deals combat damage to a player, put a +1/+1 counter on it."
Vorosh, the Hunter80%
$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."
. If you do, put six +1/+1 counters on this card."
Deep Goblin Skulltaker79%
$0.15↓#19093↓0.002.9 years
"Menace"
Stormblood Berserker78%
$0.06↓#24245↓0.0015.3 years↑
"Menace"
Black Widow, Super Spy78%
$1.70↑#13601↓0.37↑0.3 years↓
"Menace"
Rune-Scarred Demon78%
$1.20↑#1308↑0.43↑15.3 years↑
"When this creature enters, search your library for a card, put it into your hand, then shuffle."
Roxxon Brutes78%
$0.11↓#20225↓0.090.3 years↓
"Menace"
Vogar, Necropolis Tyrant77%
$12.57↑#13752↓0.20↑4.0 years
"Menace"
Arcbound Tracker77%
$0.24↓#9940↓0.065.3 years↑
"Menace"
Slith Bloodletter76%
$0.10↓#29909↓0.0023.0 years↑
"Whenever this creature deals combat damage to a player, put a +1/+1 counter on it."