Stun {1}{R}
Instant
Target creature 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.
Coward // Killer 91%
$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."
Horde Ambusher 85%
$0.04#25009
"When this creature is turned face up, 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."
Arena Athlete 84%
$0.09#24180
"Whenever you cast a spell that targets this creature, target creature an opponent controls can't block this turn."
Goblin Battle Jester 83%
$0.08#19862
"Whenever you cast a red spell, target creature can't block this turn."
Jet's Brainwashing 82%
$0.17#13491
"Target creature can't block this turn. If this spell was kicked, gain control of that creature until end of turn, untap it, and it gains haste until end of turn."
Academic Dispute 81%
$0.25#17594
"Target creature blocks this turn if able. You may have it gain reach until end of turn."
Malicious Intent 80%
$0.02#28868
"Enchanted creature has "{T}: Target creature can't block this turn.""