Mockingbird, Ace Agent 

Legendary Creature — Human Spy Hero
$0.16 #23316 0.00 0.2 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%
$0.33↑#186750.33↑12.9 years↑
"Whenever you cast a spell that targets this creature, put a +1/+1 counter on it."
+1 more matching line
Lagonna-Band Trailblazer95%
$0.10↓#210660.25↑12.3 years↑
"Whenever you cast a spell that targets this creature, put a +1/+1 counter on it."
War-Wing Siren94%
$0.07↓#27997↓0.29↑12.3 years↑
"Whenever you cast a spell that targets this creature, put a +1/+1 counter on this creature."
Satyr Hoplite94%
$0.13↓#210920.44↑12.3 years↑
"Whenever you cast a spell that targets this creature, put a +1/+1 counter on this creature."
Akroan Skyguard94%
$0.11↓#195040.29↑12.6 years↑
"Whenever you cast a spell that targets this creature, put a +1/+1 counter on this creature."
Setessan Oathsworn94%
$0.14↓#237530.12↑12.6 years↑
"Whenever you cast a spell that targets this creature, put two +1/+1 counters on this creature."
Pheres-Band Thunderhoof94%
$0.08↓#29215↓0.22↑12.3 years↑
"Whenever you cast a spell that targets this creature, put two +1/+1 counters on this creature."
Staunch-Hearted Warrior94%
$0.03↓#28035↓0.26↑12.9 years↑
"Whenever you cast a spell that targets this creature, put two +1/+1 counters on this creature."
Centaur Battlemaster94%
$0.06↓#262400.32↑12.9 years↑
"Whenever you cast a spell that targets this creature, put three +1/+1 counters on this creature."
Dawnbringer Charioteers94%
$0.26↑#222610.0012.4 years↑
"Whenever you cast a spell that targets this creature, put a +1/+1 counter on this creature."
Colleen Wing, Street Samurai91%
$0.19↑#211840.000.2 years
"Whenever you cast a spell that targets a creature you control, put a +1/+1 counter on this card. Scry 1."
Phalanx Leader90%
$0.25↑#11311↑0.29↑13.0 years↑
"Whenever you cast a spell that targets this creature, put a +1/+1 counter on each creature you control."
Wingsteed Rider88%
$0.03↓#228020.18↑12.9 years↑
"Whenever you cast a spell that targets this creature, put a +1/+1 counter on this creature."
Brigone, Soldier of Meletis87%
$1.62↑#8914↑0.17↑1.8 years↑
"Whenever you cast a spell that targets this card, put a +1/+1 counter on this card."
Bloodcrazed Hoplite86%
$0.09↓#262460.0512.3 years↑
"Whenever you cast a spell that targets this creature, put a +1/+1 counter on it."
Sage of Hours86%
$12.02↑#7868↑1.05↑12.3 years↑
"Whenever you cast a spell that targets this creature, put a +1/+1 counter on it."
Hero of Leina Tower86%
$0.15↓#266110.19↑12.6 years↑
"Whenever you cast a spell that targets this creature, you may pay
. If you do, put X +1/+1 counters on this creature."
Favored Hoplite85%
$0.18↑#191170.33↑12.9 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."