Invert Polarity 
Instant
$0.59 #2264 0.41 2.3 years
Choose target spell, then flip a coin. If you win the flip, gain control of that spell and you may choose new targets for it. If you lose the flip, counter that spell.
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Cards similar to Invert Polarity expected a card that isn't here?
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Aethersnatch87%
$1.14↑#14185↓0.5010.9 years↑
"Gain control of target spell. You may choose new targets for it."
Commandeer80%
$3.49↑#18821.08↑20.2 years↑
"Gain control of target noncreature spell. You may choose new targets for it."
Chef's Kiss78%
$0.38↓#5518↓0.12↓5.5 years↑
"Gain control of target spell that targets only a single permanent or player. Copy it, then reselect the targets at random for the spell and the copy. The new targets can't be you or a permanent you control."
Sudden Substitution76%
$6.73↑#6839↓0.477.2 years↑
"Exchange control of target noncreature spell and target creature. Then the spell's controller may choose new targets for it."
Desertion72%
$0.57↓#7330↓0.76↑29.7 years↑
"Counter target spell. If an artifact or creature spell is countered this way, put that card onto the battlefield under your control instead of into its owner's graveyard."
Perplexing Chimera72%
$1.51↑#5514↓0.5012.7 years↑
"Whenever an opponent casts a spell, you may exchange control of this creature and that spell. If you do, you may choose new targets for the spell."
Redirect72%
$0.33↓#9185↓0.29↓16.3 years↑
"You may choose new targets for target spell."
Cancel70%
$0.07↓#20870.3120.0 years↑
"Counter target spell."
Shunt70%
$0.93↑#14377↓0.11↓22.7 years↑
"Change the target of target spell with a single target."
Swerve70%
$0.37↓#15740↓0.10↓18.0 years↑
"Change the target of target spell with a single target."