Purelace 
Instant
$0.45 #30752 0.29 33.1 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%
$0.43↓#314570.67↑33.1 years
"Target spell or permanent becomes green."
Thoughtlace94%
$0.40↓#253690.3533.1 years
"Target spell or permanent becomes blue."
Chaoslace94%
$0.32↓#301010.3833.1 years
"Target spell or permanent becomes red."
Deathlace93%
$0.39↓#299650.3133.1 years
"Target spell or permanent becomes black."
Moonlace92%
$0.45#17725↑0.2819.9 years↓
"Target spell or permanent becomes colorless."
Prismatic Lace86%
$4.30↑#22230↑0.65↑29.9 years↓
"Target permanent becomes the color or colors of your choice."
Sleight of Mind81%
$0.32↓#18021↑0.50↑33.1 years
"Change the text of target spell or permanent by replacing all instances of one color word with another."
Alchor's Tomb79%
$17.84↑#294270.2232.3 years
"
, 
: Target permanent you control becomes the color of your choice."
, : Target permanent you control becomes the color of your choice."
Aurora Griffin78%
$0.13↓#288680.2425.6 years↓
": Target permanent becomes white until end of turn."
: Target permanent becomes white until end of turn."
Heaven's Gate76%
$10.52↑#18904↑0.2132.3 years
"One or more target creatures become white until end of turn."
Ersatz Gnomes75%
$0.23↓#279080.2129.9 years↓
": Target permanent becomes colorless until end of turn."
: Target permanent becomes colorless until end of turn."
Magical Hack75%
$2.59↑#22066↑0.3833.1 years
"Change the text of target spell or permanent by replacing all instances of one basic land type with another."
Illusion // Reality74%
$0.05↓#286680.3325.3 years↓
"Target spell or permanent becomes the color of your choice until end of turn."
Cloudchaser Kestrel74%
$0.14↓#16096↑0.10↓19.9 years↓
": Target permanent becomes white until end of turn."
: Target permanent becomes white until end of turn."
Deflection74%
$0.31↓#22301↑0.2731.3 years↓
"Change the target of target spell with a single target."
Rebound74%
$0.20↓#276870.3628.5 years↓
"Change the target of target spell that targets only a player. The new target must be a player."
Prismwake Merrow73%
$0.07↓#303000.2418.3 years↓
"When this creature enters, target permanent becomes the color or colors of your choice until end of turn."
Blind Seer72%
$0.87↑#19028↑0.43↑25.9 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%
$0.71↑#268910.3527.6 years↓
"All permanents are colorless."
Indigo Faerie72%
$0.18↓#281740.2518.1 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."