Luminesce 
Instant
$0.13 #29324 0.30 20.1 years
Prevent all damage that black sources and red sources would deal this turn.
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Cards similar to Luminesce 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.
Radiant Kavu86%
$0.32↑#285740.2225.6 years↑
"
: Prevent all combat damage blue creatures and black creatures would deal this turn."
: Prevent all combat damage blue creatures and black creatures would deal this turn."
Thwart the Enemy82%
$0.15↑#14375↑0.10↓6.4 years↓
"Prevent all damage that would be dealt this turn by creatures your opponents control."
Inquisitor's Snare82%
$0.26↑#278080.00↓18.3 years↓
"Prevent all damage target attacking or blocking creature would deal this turn. If that creature is black or red, destroy it."
Terrifying Presence81%
$0.24↑#11824↑0.2614.3 years↓
"Prevent all combat damage that would be dealt by creatures other than target creature this turn."
Sacred Knight80%
$0.36↑#314650.3129.3 years↑
"This creature can't be blocked by black and/or red creatures."
Penance80%
$4.71↑#9914↑0.00↓28.2 years↑
"Put a card from your hand on top of your library: The next time a black or red source of your choice would deal damage this turn, prevent that damage."
Kithkin Zealot80%
$0.13#276200.40↑18.1 years↓
"When this creature enters, you gain 1 life for each black and/or red permanent target opponent controls."
Samite Ministration79%
$0.19↑#279030.53↑25.9 years↑
"Prevent all damage that would be dealt to you this turn by a source of your choice. Whenever damage from a black or red source is prevented this way this turn, you gain that much life."
Undergrowth78%
$0.19↑#21581↑0.2930.2 years↑
"Prevent all combat damage that would be dealt this turn. If this spell's additional cost was paid, this effect doesn't affect combat damage that would be dealt by red creatures."
Honorable Scout78%
$0.18↑#274410.00↓25.6 years↑
"When this creature enters, you gain 2 life for each black and/or red creature target opponent controls."
Hunter's Ambush78%
$0.13#20159↑0.40↑12.1 years↓
"Prevent all combat damage that would be dealt by nongreen creatures this turn."
Haze Frog78%
$0.37↑#9855↑0.43↑16.4 years↓
"When this creature enters, prevent all combat damage that other creatures would deal this turn."
Paladin en-Vec77%
$0.31↑#22523↑0.43↑28.2 years↑
"First strike, protection from black and from red"
Obscuring Haze77%
$4.85↑#1503↑0.84↑6.4 years↓
"Prevent all damage that would be dealt this turn by creatures your opponents control."
Serene Sunset76%
$0.22↑#21304↑0.3124.3 years↑
"Prevent all combat damage X target creatures would deal this turn."
Greater Realm of Preservation76%
$0.22↑#296040.17↓32.3 years↑
"
: The next time a black or red source of your choice would deal damage to you this turn, prevent that damage."
: The next time a black or red source of your choice would deal damage to you this turn, prevent that damage."
Prismatic Strands76%
$5.94↑#12093↑0.07↓24.3 years↑
"Prevent all damage that sources of the color of your choice would deal this turn."
Tanglesap76%
$0.07↓#21474↑0.00↓16.9 years↓
"Prevent all combat damage that would be dealt this turn by creatures without trample."
Harmless Assault76%
$0.12↓#250980.3716.4 years↓
"Prevent all combat damage that would be dealt this turn by attacking creatures."
Surge of Salvation75%
$0.37↑#3004↑0.243.4 years↓
"You and permanents you control gain hexproof until end of turn. Prevent all damage that black and/or red sources would deal to creatures you control this turn."