Prismatic Strands 
Instant
$6.34 #12124 0.40 24.4 years
Prevent all damage that sources of the color of your choice would deal this turn.
Flashback—Tap an untapped white creature you control. (You may cast this card from your graveyard for its flashback cost. Then exile it.)
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Cards similar to Prismatic Strands 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.
Battle Screech94%
$0.17↓#7705↑0.06↓24.4 years
"Flashback—Tap three untapped white creatures you control. You may cast this card from your graveyard for its flashback cost. Then exile it."
Obscuring Haze85%
$4.76↓#1491↑0.72↑6.5 years↓
"Prevent all damage that would be dealt this turn by creatures your opponents control."
Group Project83%
$0.14↓#19352↓0.09↓0.5 years↓
"Flashback—Tap three untapped creatures you control. You may cast this card from your graveyard for its flashback cost. Then exile it."
Thwart the Enemy83%
$0.21↓#14560↓0.29↓6.5 years↓
"Prevent all damage that would be dealt this turn by creatures your opponents control."
Terrifying Presence82%
$0.25↓#120610.81↑14.5 years↓
"Prevent all combat damage that would be dealt by creatures other than target creature this turn."
Moment's Peace80%
$4.52↓#5742↑0.81↑25.1 years
"Prevent all combat damage that would be dealt this turn."
+1 more matching line
Avacyn, Guardian Angel77%
$1.65↓#14704↓0.26↓12.3 years↓
"
: Prevent all damage that would be dealt to another target creature this turn by sources of the color of your choice."
: Prevent all damage that would be dealt to another target creature this turn by sources of the color of your choice."
Serene Sunset76%
$0.22↓#21479↓0.29↓24.4 years
"Prevent all combat damage X target creatures would deal this turn."
Embolden76%
$0.20↓#23082↓0.06↓25.1 years
"Flashback You may cast this card from your graveyard for its flashback cost. Then exile it."
You may cast this card from your graveyard for its flashback cost. Then exile it."+1 more matching line
Encircling Fissure76%
$0.18↓#20964↓0.20↓11.0 years↓
"Prevent all combat damage that would be dealt this turn by creatures target opponent controls."
Reverent Mantra76%
$14.84↑#134650.27↓27.0 years↑
"Choose a color. All creatures gain protection from the chosen color until end of turn."
+1 more matching line
Gaze of Justice75%
$0.11↓#24622↓0.18↓20.0 years↓
"Flashback 
You may cast this card from your graveyard for its flashback cost and any additional costs. Then exile it."
You may cast this card from your graveyard for its flashback cost and any additional costs. Then exile it."
Roar of the Wurm75%
$0.28↓#19598↓0.27↓25.1 years
"Flashback 
You may cast this card from your graveyard for its flashback cost. Then exile it."
You may cast this card from your graveyard for its flashback cost. Then exile it."
Winds of Qal Sisma74%
$0.25↓#98660.28↓11.7 years↓
"Prevent all combat damage that would be dealt this turn."
Haze Frog74%
$0.31↓#100670.64↑16.5 years↓
"When this creature enters, prevent all combat damage that other creatures would deal this turn."
Prismatic Ward74%
$0.12↓#26765↓0.25↓31.4 years↑
"Prevent all damage that would be dealt to enchanted creature by sources of the chosen color."
Hindervines74%
$0.19↓#16067↓0.3313.7 years↓
"Prevent all combat damage that would be dealt this turn by creatures with no +1/+1 counters on them."
Harmless Assault74%
$0.12↓#25297↓0.12↓16.5 years↓
"Prevent all combat damage that would be dealt this turn by attacking creatures."
Ethereal Haze74%
$1.44↓#8539↑0.07↓22.1 years↓
"Prevent all damage that would be dealt by creatures this turn."
Root Snare74%
$0.19↓#118010.338.3 years↓
"Prevent all combat damage that would be dealt this turn."