Purelace 
Instant
$0.43 #30960 0.13 33.2 years
Target spell or permanent becomes white. (Mana symbols on that permanent remain unchanged.)
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Cards similar to Purelace expected a card that isn't here?
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Lifelace94%
$0.44↑#317460.1233.2 years
"Target spell or permanent becomes green."
Thoughtlace94%
$0.42↓#255310.0733.2 years
"Target spell or permanent becomes blue."
Chaoslace94%
$0.34↓#303920.00↓33.2 years
"Target spell or permanent becomes red."
Deathlace93%
$0.39↓#303040.0633.2 years
"Target spell or permanent becomes black."
Moonlace92%
$0.35↓#17877↑0.32↑20.0 years↓
"Target spell or permanent becomes colorless."
Prismatic Lace86%
$4.70↑#22386↑0.1130.0 years↓
"Target permanent becomes the color or colors of your choice."
Sleight of Mind81%
$0.31↓#18031↑0.00↓33.2 years
"Change the text of target spell or permanent by replacing all instances of one color word with another."
Alchor's Tomb79%
$17.97↑#294520.24↑32.4 years
"
, 
: Target permanent you control becomes the color of your choice."
, : Target permanent you control becomes the color of your choice."
Aurora Griffin78%
$0.12↓#292310.1925.7 years↓
": Target permanent becomes white until end of turn."
: Target permanent becomes white until end of turn."
Heaven's Gate76%
$14.33↑#19115↑0.0632.4 years
"One or more target creatures become white until end of turn."
Ersatz Gnomes75%
$0.20↓#280790.1130.0 years↓
": Target permanent becomes colorless until end of turn."
: Target permanent becomes colorless until end of turn."
Magical Hack75%
$1.95↑#22135↑0.23↑33.2 years
"Change the text of target spell or permanent by replacing all instances of one basic land type with another."
Illusion // Reality74%
$0.09↓#288410.1225.4 years↓
"Target spell or permanent becomes the color of your choice until end of turn."
Cloudchaser Kestrel74%
$0.14↓#16455↑0.0520.0 years↓
": Target permanent becomes white until end of turn."
: Target permanent becomes white until end of turn."
Deflection74%
$0.32↓#22450↑0.0631.4 years↓
"Change the target of target spell with a single target."
Rebound74%
$0.20↓#278900.27↑28.6 years↓
"Change the target of target spell that targets only a player. The new target must be a player."
Prismwake Merrow73%
$0.09↓#305500.1118.5 years↓
"When this creature enters, target permanent becomes the color or colors of your choice until end of turn."
Blind Seer72%
$0.85↑#19137↑0.1426.0 years↓
"
: Target spell or permanent becomes the color of your choice until end of turn."
: Target spell or permanent becomes the color of your choice until end of turn."
Thran Lens72%
$0.69↑#271160.47↑27.7 years↓
"All permanents are colorless."
Indigo Faerie72%
$0.18↓#284770.00↓18.2 years↓
": Target permanent becomes blue in addition to its other colors until end of turn."
: Target permanent becomes blue in addition to its other colors until end of turn."