Arena Athlete 

Creature — Human
Heroic — Whenever you cast a spell that targets this creature, target creature an opponent controls can't block this turn.
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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.
Horde Ambusher 88%
$0.04#25009
"When this creature is turned face up, target creature can't block this turn."
Coward // Killer 87%
$0.29#15112
"Target creature can't block this turn and becomes a Coward in addition to its other types until end of turn."
Quakefoot Cyclops 86%
$0.21#22990
"When you cycle this card, target creature can't block this turn."
Renegade Wheelsmith 85%
$0.12#17647
"Whenever this creature becomes tapped, target creature can't block this turn."
Goblin Battle Jester 84%
$0.08#19862
"Whenever you cast a red spell, target creature can't block this turn."
Kami of Fire's Roar 81%
$0.08#26641
"Whenever you cast a Spirit or Arcane spell, target creature can't block this turn."