Off Balance 
Instant
$0.10 #30721 0.24 26.6 years
Target creature can't attack or block this turn.
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Cards similar to Off Balance 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.
Thundersong Trumpeter94%
$0.06↓#20472↑0.1420.9 years↓
"
: Target creature can't attack or block this turn."
Alchemist's Vial86%
$0.31↑#11213↑0.73↑11.1 years↓
"
,
, Sacrifice this artifact: Target creature can't attack or block this turn."
Detained by Legionnaires86%
$0.12↑#17704↑0.55↑2.2 years↓
"Enchanted creature can't attack or block."
Unearthly Blizzard84%
$0.11↑#262180.39↑21.9 years↓
"Up to three target creatures can't block this turn."
Kulrath Knight84%
$0.21↑#5581↑0.44↑18.3 years↓
"Creatures your opponents control with counters on them can't attack or block."
Spara's Adjudicators83%
$0.11↑#23458↑0.184.4 years↓
"When this creature enters, target creature an opponent controls can't attack or block until your next turn."
Fervent Cathar83%
$0.04↓#285770.07↓14.3 years↓
"When this creature enters, target creature can't block this turn."
Summit Intimidator83%
$0.06↓#247450.281.4 years↓
"When this creature enters, target creature can't block this turn."
Crossway Vampire83%
$0.14↑#254350.2914.9 years↓
"When this creature enters, target creature can't block this turn."