Celestial Dawn 
Enchantment
$0.47 #17265 0.07 29.9 years
Lands you control are Plains.
Nonland permanents you control are white. The same is true for spells you control and nonland cards you own that aren't on the battlefield.
You may spend white mana as though it were mana of any color. You may spend other mana only as though it were colorless mana.
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Cards similar to Celestial Dawn 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.
Realmwright86%
$0.28↓#186640.1413.6 years↓
"Lands you control are the chosen type in addition to their other types."
Prismatic Omen86%
$3.21↑#3511↑0.26↑18.3 years↓
"Lands you control are every basic land type in addition to their other types."
Blanket of Night84%
$1.11↑#165940.33↑29.6 years
"Each land is a Swamp in addition to its other land types."
Mycosynth Lattice84%
$35.50↑#2051↑1.22↑22.6 years↓
"Players may spend mana as though it were mana of any color."
+1 more matching line
Yavimaya, Cradle of Growth83%
$15.42↑#77↑0.29↑5.3 years↓
"Each land is a Forest in addition to its other land types."
Urborg, Tomb of Yawgmoth82%
$53.04↑#73↑0.49↑19.6 years↓
"Each land is a Swamp in addition to its other land types."
Dryad of the Ilysian Grove80%
$9.26↑#303↑0.49↑6.6 years↓
"Lands you control are every basic land type in addition to their other types."
Swampbenders78%
$0.39↓#176390.000.8 years↓
"Lands you control are Swamps in addition to their other types."
False Dawn78%
$0.31↓#28238↓0.0025.3 years↓
"Until end of turn, spells and abilities you control that would add colored mana instead add that much white mana. Until end of turn, you may spend white mana as though it were mana of any color."
Leyline of the Guildpact76%
$3.41↑#1738↑0.45↑2.6 years↓
"Lands you control are every basic land type in addition to their other types."
+1 more matching line
Energybending76%
$0.27↓#6404↑0.000.8 years↓
"Lands you control gain all basic land types until end of turn."
Sunglasses of Urza74%
$0.69↑#25659↓0.1133.1 years↑
"You may spend white mana as though it were red mana."
Stormtide Leviathan74%
$0.51↑#2864↑0.94↑16.1 years↓
"All lands are Islands in addition to their other types."
Glaciers74%
$0.54↑#29115↓0.69↑31.3 years↑
"All Mountains are Plains."
Conversion73%
$0.24↓#26556↓1.18↑33.1 years↑
"All Mountains are Plains."
Terraformer72%
$0.04↓#31125↓0.1520.9 years↓
": Choose a basic land type. Each land you control becomes that type until end of turn."
: Choose a basic land type. Each land you control becomes that type until end of turn."
Dune Chanter71%
$1.46↑#6117↑0.122.4 years↓
"Lands you control and land cards you own that aren't on the battlefield are Deserts in addition to their other types."
Lush Growth71%
$0.10↓#22017↓0.0017.9 years↓
"Enchanted land is a Mountain, Forest, and Plains."
Chromatic Orrery70%
$34.10↑#1252↑0.60↑6.2 years↓
"You may spend mana as though it were mana of any color."
Painter's Servant70%
$34.83↑#7116↑1.04↑18.3 years↓
"All cards that aren't on the battlefield, spells, and permanents are the chosen color in addition to their other colors."