Mockingbird, Ace Agent 
Legendary Creature — Human Spy Hero
$0.15 #22597 0.19 0.3 years
Double strike
Whenever you cast a spell that targets a creature you control, put a +1/+1 counter on Mockingbird.
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Cards similar to Mockingbird, Ace Agent 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.
Fabled Hero95%
$0.29↑#190150.00↓13.1 years↑
"Whenever you cast a spell that targets this creature, put a +1/+1 counter on it."
+1 more matching line
Lagonna-Band Trailblazer95%
$0.12↓#212210.06↓12.5 years↑
"Whenever you cast a spell that targets this creature, put a +1/+1 counter on it."
War-Wing Siren94%
$0.06↓#28251↓0.00↓12.5 years↑
"Whenever you cast a spell that targets this creature, put a +1/+1 counter on this creature."
Akroan Skyguard94%
$0.13↓#196760.00↓12.7 years↑
"Whenever you cast a spell that targets this creature, put a +1/+1 counter on this creature."
Satyr Hoplite94%
$0.13↓#212510.07↓12.5 years↑
"Whenever you cast a spell that targets this creature, put a +1/+1 counter on this creature."
Setessan Oathsworn94%
$0.16↑#238890.1112.7 years↑
"Whenever you cast a spell that targets this creature, put two +1/+1 counters on this creature."
Pheres-Band Thunderhoof94%
$0.13↓#29546↓0.07↓12.5 years↑
"Whenever you cast a spell that targets this creature, put two +1/+1 counters on this creature."
Staunch-Hearted Warrior94%
$0.03↓#28363↓0.00↓13.1 years↑
"Whenever you cast a spell that targets this creature, put two +1/+1 counters on this creature."
Centaur Battlemaster94%
$0.07↓#265660.06↓13.1 years↑
"Whenever you cast a spell that targets this creature, put three +1/+1 counters on this creature."
Dawnbringer Charioteers94%
$0.26↑#225640.00↓12.5 years↑
"Whenever you cast a spell that targets this creature, put a +1/+1 counter on this creature."
Phalanx Leader90%
$0.26↑#11509↑0.2913.1 years↑
"Whenever you cast a spell that targets this creature, put a +1/+1 counter on each creature you control."
Colleen Wing, Street Samurai90%
$0.23↑#201210.160.3 years
"Whenever you cast a spell that targets a creature you control, put a +1/+1 counter on this card. Scry 1."
Wingsteed Rider89%
$0.06↓#231350.00↓13.1 years↑
"Whenever you cast a spell that targets this creature, put a +1/+1 counter on this creature."
Brigone, Soldier of Meletis87%
$1.66↑#8778↑0.00↓1.9 years↑
"Whenever you cast a spell that targets this card, put a +1/+1 counter on this card."
Bloodcrazed Hoplite86%
$0.11↓#265890.40↑12.5 years↑
"Whenever you cast a spell that targets this creature, put a +1/+1 counter on it."
Sage of Hours86%
$10.34↑#7793↑0.97↑12.5 years↑
"Whenever you cast a spell that targets this creature, put a +1/+1 counter on it."
Hero of Leina Tower86%
$0.15#269380.1412.7 years↑
"Whenever you cast a spell that targets this creature, you may pay 
. If you do, put X +1/+1 counters on this creature."
. If you do, put X +1/+1 counters on this creature."
Favored Hoplite86%
$0.18↑#192960.00↓13.1 years↑
"Whenever you cast a spell that targets this creature, put a +1/+1 counter on this creature and prevent all damage that would be dealt to it this turn."
Illuminator Virtuoso86%
$0.21↑#16668↑0.06↓4.5 years↑
"Double strike"
Legolas, Master Archer84%
$0.29↑#9525↑0.44↑3.3 years↑
"Whenever you cast a spell that targets this card, put a +1/+1 counter on this card."