Thoughtlace 
Instant
$0.42 #25531 0.07 33.2 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%
$0.34↓#303920.0033.2 years
"Target spell or permanent becomes red."
Purelace94%
$0.43↑#30960↓0.1333.2 years
"Target spell or permanent becomes white."
Deathlace94%
$0.39↓#303040.0633.2 years
"Target spell or permanent becomes black."
Lifelace92%
$0.44↑#31746↓0.1233.2 years
"Target spell or permanent becomes green."
Moonlace92%
$0.35↓#17877↑0.32↑20.0 years↓
"Target spell or permanent becomes colorless."
Prismatic Lace88%
$4.70↑#223860.1130.0 years↓
"Target permanent becomes the color or colors of your choice."
Sleight of Mind82%
$0.31↓#18031↑0.0033.2 years
"Change the text of target spell or permanent by replacing all instances of one color word with another."
Alchor's Tomb82%
$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."
Indigo Faerie77%
$0.18↓#284770.0018.2 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."
Illusion // Reality76%
$0.09↓#288410.1225.4 years↓
"Target spell or permanent becomes the color of your choice until end of turn."
Prismwake Merrow76%
$0.09↓#305500.1118.5 years↓
"When this creature enters, target permanent becomes the color or colors of your choice until end of turn."
Magical Hack76%
$1.95↑#221350.23↑33.2 years
"Change the text of target spell or permanent by replacing all instances of one basic land type with another."
Blind Seer75%
$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."
Sea Kings' Blessing75%
$5.68↑#255490.1432.4 years
"One or more target creatures become blue until end of turn."
Ersatz Gnomes74%
$0.20↓#280790.1130.0 years↓
": Target permanent becomes colorless until end of turn."
: Target permanent becomes colorless until end of turn."
Distorting Lens74%
$0.78↑#15419↑0.0027.0 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%
$0.32↓#224500.0631.4 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."
Aurora Griffin72%
$0.12↓#292310.19↑25.7 years↓
"
: Target permanent becomes white until end of turn."
: Target permanent becomes white until end of turn."
Meddle71%
$0.19↓#215720.50↑30.0 years↓
"If target spell has only one target and that target is a creature, change that spell's target to another creature."