Thoughtlace 
Instant
$0.40 #25369 0.35 33.1 years
Target spell or permanent becomes blue. (Mana symbols on that permanent remain unchanged.)
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Cards similar to Thoughtlace expected a card that isn't here?
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Chaoslace94%
$0.32↓#301010.3833.1 years
"Target spell or permanent becomes red."
Purelace94%
$0.45↑#30752↓0.2933.1 years
"Target spell or permanent becomes white."
Deathlace94%
$0.39↓#299650.3133.1 years
"Target spell or permanent becomes black."
Lifelace92%
$0.43↑#31457↓0.67↑33.1 years
"Target spell or permanent becomes green."
Moonlace92%
$0.45↑#17725↑0.2819.9 years↓
"Target spell or permanent becomes colorless."
Prismatic Lace88%
$4.30↑#222300.65↑29.9 years↓
"Target permanent becomes the color or colors of your choice."
Sleight of Mind82%
$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 Tomb82%
$17.84↑#294270.22↓32.3 years
"
, 
: Target permanent you control becomes the color of your choice."
, : Target permanent you control becomes the color of your choice."
Indigo Faerie77%
$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."
Illusion // Reality76%
$0.05↓#286680.3325.3 years↓
"Target spell or permanent becomes the color of your choice until end of turn."
Prismwake Merrow76%
$0.07↓#303000.24↓18.3 years↓
"When this creature enters, target permanent becomes the color or colors of your choice until end of turn."
Magical Hack76%
$2.59↑#220660.3833.1 years
"Change the text of target spell or permanent by replacing all instances of one basic land type with another."
Blind Seer75%
$0.87↑#19028↑0.4325.9 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."
Sea Kings' Blessing75%
$5.65↑#253160.2932.3 years
"One or more target creatures become blue until end of turn."
Ersatz Gnomes74%
$0.23↓#279080.21↓29.9 years↓
": Target permanent becomes colorless until end of turn."
: Target permanent becomes colorless until end of turn."
Distorting Lens74%
$0.77↑#15402↑0.2526.9 years↓
": Target permanent becomes the color of your choice until end of turn."
: Target permanent becomes the color of your choice until end of turn."
Deflection74%
$0.31↓#223010.2731.3 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."
Aurora Griffin72%
$0.13↓#288680.24↓25.6 years↓
"
: Target permanent becomes white until end of turn."
: Target permanent becomes white until end of turn."
Meddle71%
$0.18↓#213700.20↓29.9 years↓
"If target spell has only one target and that target is a creature, change that spell's target to another creature."