Riptide 
Instant
$0.31 #28883 0.43 32.1 years
Tap all blue creatures.
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Cards similar to Riptide 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.
Mudbrawler Raiders80%
$0.07↓#311280.06↓18.3 years↓
"This creature can't be blocked by blue creatures."
Karoo Meerkat76%
$0.17↓#301080.29↓29.9 years↓
"Protection from blue"
Yavimaya Barbarian76%
$0.08↓#294980.07↓25.9 years↓
"Protection from blue"
Nacatl Outlander76%
$0.10↓#279450.19↓17.6 years↓
"Protection from blue"
Guma76%
$0.26↓#299060.63↑27.9 years↓
"Protection from blue"
Fylamarid75%
$0.21↓#282580.00↓28.9 years↓
"This creature can't be blocked by blue creatures."
Metathran Transport75%
$0.14↓#301320.57↑25.9 years↓
"This creature can't be blocked by blue creatures."
Blue Scarab74%
$0.27↓#250000.00↓31.3 years
"Enchanted creature can't be blocked by blue creatures."
Windreaper Falcon73%
$0.22↓#313750.29↓29.9 years↓
"Flying, protection from blue"
Voice of Reason73%
$0.38↑#280620.19↓27.2 years↓
"Flying, protection from blue"
Thundermare72%
$0.89↑#18811↑0.14↓29.3 years↓
"When this creature enters, tap all other creatures."
Shrieking Mogg72%
$0.52↑#251180.88↑26.6 years↓
"When this creature enters, tap all other creatures."
Magistrate's Veto72%
$0.25↓#252580.4526.9 years↓
"White creatures and blue creatures can't block."
Whimwader72%
$0.08↓#318830.00↓18.3 years↓
"This creature can't attack unless defending player controls a blue permanent."
Scragnoth72%
$0.14↓#308450.00↓28.9 years↓
"Protection from blue"
Thelon's Curse71%
$0.69↑#315490.93↑31.8 years
"Blue creatures don't untap during their controllers' untap steps."
Magnetic Mountain71%
$0.41↑#23092↑1.04↑32.7 years
"Blue creatures don't untap during their controllers' untap steps."
Subjugator Angel71%
$0.30↓#9507↑0.62↑10.1 years↓
"When this creature enters, tap all creatures your opponents control."
Bloated Toad71%
$0.35↑#19578↑0.60↑27.6 years↓
"Protection from blue"
Llawan, Cephalid Empress70%
$0.88↑#15287↑1.03↑24.6 years↓
"Your opponents can't cast blue creature spells."