Captain Mar-Vell, Space-Born 

Legendary Creature — Kree Soldier Hero
$0.12 #16756 0.00 0.2 years
Flying, vigilance
Cosmic Awareness — As long as an opponent has cast a spell this turn, you may cast spells as though they had flash.
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Cards similar to Captain Mar-Vell, Space-Born 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.
High Fae Trickster94%
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"You may cast spells as though they had flash."
+1 more matching line
Final-Word Phantom93%
$1.97↑#8008↑0.60↑2.6 years↑
"During each opponent's end step, you may cast spells as though they had flash."
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$4.91↑#650↑0.46↑3.2 years↑
"You may cast spells this turn as though they had flash."
Leyline of Anticipation90%
$3.40↑#735↑0.56↑16.1 years↑
"You may cast spells as though they had flash."
Hypersonic Dragon86%
$0.33↑#13128↑0.21↑13.9 years↑
"You may cast sorcery spells as though they had flash."
The Blue Spirit86%
$0.88↑#7467↑0.000.8 years
"You may cast the first creature spell you cast each turn as though it had flash."
Alchemist's Refuge86%
$0.38↑#1104↑0.21↑14.3 years↑
"
,
: You may cast spells this turn as though they had flash."
Shimmer Myr86%
$0.38↑#1321↑0.30↑15.6 years↑
"You may cast artifact spells as though they had flash."
Tidal Barracuda82%
$7.59↑#4364↑0.63↑6.4 years↑
"Any player may cast spells as though they had flash."
Quicksilver, Speedster82%
$0.24↑#168700.000.2 years
"As long as this card is tapped, you may cast spells as though they had flash."
Sally Sparrow80%
$0.35↑#142260.002.9 years↑
"You may cast creature spells as though they had flash."
Aluren79%
$99.98↑#9629↑0.58↑28.9 years↑
"Any player may cast creature spells with mana value 3 or less without paying their mana costs and as though they had flash."
Raff Capashen, Ship's Mage79%
$0.26↑#6407↑0.068.4 years↑
"You may cast historic spells as though they had flash."
Vernal Equinox78%
$1.20↑#180560.0726.9 years↑
"Any player may cast creature and enchantment spells as though they had flash."
Winding Canyons78%
$34.70↑#7608↑0.25↑29.2 years↑
"
,
: You may cast creature spells this turn as though they had flash."
Radagast of Rhosgobel78%
$5.32↑#7618↑0.000.1 years
"The first creature spell you cast each turn costs
less to cast and can be cast as though it had flash."
Skittering Cicada78%
$13.26↑#3346↑0.31↑3.1 years↑
"You may cast colorless spells as though they had flash."
Yeva, Nature's Herald78%
$0.81↑#3390↑0.24↑14.1 years↑
"You may cast green creature spells as though they had flash."