Wingsteed Rider {1}{W}{W}
Creature — Human Knight
Flying
Heroic — Whenever you cast a spell that targets this creature, put a +1/+1 counter on this creature.
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Cards that do something similar 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.
Satyr Hoplite 100%
$0.17#20684
"Whenever you cast a spell that targets this creature, put a +1/+1 counter on this creature."
Dawnbringer Charioteers 100%
$0.26#21872
"Whenever you cast a spell that targets this creature, put a +1/+1 counter on this creature."
War-Wing Siren 100%
$0.07#27771
"Whenever you cast a spell that targets this creature, put a +1/+1 counter on this creature."
+1 more matching line
Hero of Iroas 100%
$1.24#7023
"Whenever you cast a spell that targets this creature, put a +1/+1 counter on this creature."
Akroan Skyguard 100%
$0.12#19328
"Whenever you cast a spell that targets this creature, put a +1/+1 counter on this creature."
+1 more matching line
Sage of Hours 93%
$12.39#7802
"Whenever you cast a spell that targets this creature, put a +1/+1 counter on it."
Bloodcrazed Hoplite 93%
$0.09#25828
"Whenever you cast a spell that targets this creature, put a +1/+1 counter on it."
Lagonna-Band Trailblazer 93%
$0.17#20778
"Whenever you cast a spell that targets this creature, put a +1/+1 counter on it."
Fabled Hero 93%
$0.30#18364
"Whenever you cast a spell that targets this creature, put a +1/+1 counter on it."
Favored Hoplite 92%
$0.21#18959
"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."
Quirion Beastcaller 88%
$0.35#8553
"Whenever you cast a creature spell, put a +1/+1 counter on this creature."
Mossdog 83%
$0.15#27596
"Whenever this creature becomes the target of a spell or ability an opponent controls, put a +1/+1 counter on this creature."
Pyroceratops 81%
$0.19#17985
"Whenever you cast a noncreature spell, put a +1/+1 counter on this creature."
Sprite Dragon 81%
$0.71#6032
"Whenever you cast a noncreature spell, put a +1/+1 counter on this creature."
Tempest Angler 81%
$0.20#6904
"Whenever you cast a noncreature spell, put a +1/+1 counter on this creature."
Spellgorger Weird 81%
$0.13#15835
"Whenever you cast a noncreature spell, put a +1/+1 counter on this creature."
Boar-q-pine 81%
$0.09#14890
"Whenever you cast a noncreature spell, put a +1/+1 counter on this creature."
Deeproot Champion 81%
$0.27#19647
"Whenever you cast a noncreature spell, put a +1/+1 counter on this creature."
Angelic Cub 81%
$0.29#15444
"Whenever this creature becomes the target of a spell or ability for the first time each turn, put a +1/+1 counter on it."