Captain Mar-Vell, Space-Born 

Legendary Creature — Kree Soldier Hero
$0.14 #15727 0.39 0.3 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.
Final-Word Phantom93%
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"During each opponent's end step, you may cast spells as though they had flash."
Borne Upon a Wind90%
$3.07↑#645↑0.52↑3.3 years↑
"You may cast spells this turn as though they had flash."
Leyline of Anticipation90%
$4.58↑#758↑0.70↑16.3 years↑
"You may cast spells as though they had flash."
Hypersonic Dragon86%
$0.27↑#133890.3014.0 years↑
"You may cast sorcery spells as though they had flash."
The Blue Spirit86%
$1.31↑#7298↑0.330.9 years
"You may cast the first creature spell you cast each turn as though it had flash."
Alchemist's Refuge86%
$0.40↑#1113↑0.3014.5 years↑
"
,
: You may cast spells this turn as though they had flash."
Tidal Barracuda82%
$7.80↑#4426↑0.51↑6.5 years↑
"Any player may cast spells as though they had flash."
Quicksilver, Speedster82%
$0.26↑#161450.51↑0.3 years
"As long as this card is tapped, you may cast spells as though they had flash."
Sally Sparrow80%
$0.31↑#145060.50↑3.0 years↑
"You may cast creature spells as though they had flash."
Aluren80%
$93.75↑#9734↑1.44↑29.0 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%
$0.22↑#6551↑0.21↓8.5 years↑
"You may cast historic spells as though they had flash."
Skittering Cicada78%
$12.25↑#3303↑0.403.2 years↑
"You may cast colorless spells as though they had flash."
Vernal Equinox78%
$1.28↑#181170.20↓27.0 years↑
"Any player may cast creature and enchantment spells as though they had flash."
Winding Canyons78%
$36.41↑#7524↑0.3229.4 years↑
"
,
: You may cast creature spells this turn as though they had flash."
Radagast of Rhosgobel78%
$2.37↑#4221↑0.51↑0.2 years
"The first creature spell you cast each turn costs
less to cast and can be cast as though it had flash."
Yeva, Nature's Herald78%
$0.33↑#3311↑0.4114.3 years↑
"You may cast green creature spells as though they had flash."