Rapier Wit 
Instant
$0.16 #15248 0.20 0.5 years
Tap target creature. If it's your turn, put a stun counter on it. (If a permanent with a stun counter would become untapped, remove one from it instead.)
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Cards similar to Rapier Wit expected a card that isn't here?
Reports become test cases the matcher is graded against before an update ships. Delvefall isn't a chatbot guessing, it compares the printed rules text of every card with plain math, and examples like yours decide which differences should count.
Tranquilize96%
$0.14↓#132450.262.3 years↑
"Tap target creature an opponent controls and put three stun counters on it."
Procrastinate96%
$0.18↑#126780.230.5 years
"Tap target creature. Put twice X stun counters on it."
Crippling Chill94%
$0.03↓#20002↓0.2014.5 years↑
"Tap target creature. It doesn't untap during its controller's next untap step."
+1 more matching line
Fractal Mascot94%
$0.09↓#22254↓0.09↓0.5 years
"When this creature enters, tap target creature an opponent controls. Put a stun counter on it."
Fear of Immobility94%
$0.13↓#176540.252.1 years↑
"When this creature enters, tap up to one target creature. If an opponent controls that creature, put a stun counter on it."
Rowdy Snowballers94%
$0.10↓#138240.170.9 years
"When this creature enters, tap target creature an opponent controls and put a stun counter on it."
Alchemax Slayer-Bots94%
$0.19↑#180340.43↑1.1 years
"When this creature enters, tap target creature an opponent controls and put a stun counter on it."
Shipwreck Patrol94%
$0.21↑#29666↓0.160.3 years
"When this creature enters, tap target creature an opponent controls and put a stun counter on it."
Utrom Scientists94%
$0.06↓#21901↓0.31↑0.6 years
"When this creature enters, tap up to one target creature and put a stun counter on it."
Impede Momentum93%
$0.26↑#124980.47↑4.1 years↑
"Tap target creature and put three stun counters on it."
Succumb to the Cold92%
$0.28↑#10746↑0.53↑3.1 years↑
"Tap one or two target creatures an opponent controls. Put a stun counter on each of them."
Take into Custody92%
$0.04↓#23846↓0.06↓9.7 years↑
"Tap target creature. It doesn't untap during its controller's next untap step."
Press for Answers92%
$0.06↓#20546↓0.1210.5 years↑
"Tap target creature. It doesn't untap during its controller's next untap step."
Gilded Scuttler91%
$0.34↑#135670.06↓1.9 years↑
"When this creature enters, tap target creature an opponent controls and put a stun counter on it."
Riverwheel Sweep90%
$0.15↓#20717↓0.06↓1.5 years↑
"Tap target creature. Put three stun counters on it."
Origin of Captain America90%
$0.32↑#25144↓0.150.3 years
"Tap up to one target creature and put a stun counter on it."
Pressure Point90%
$0.04↓#151000.1211.7 years↑
"Tap target creature."
+1 more matching line
Chill of the Grave90%
$0.10↓#19451↓0.00↓4.9 years↑
"Tap target creature. It doesn't untap during its controller's next untap step."
+1 more matching line
Grip of the Roil90%
$0.05↓#24388↓0.1310.7 years↑
"Tap target creature. It doesn't untap during its controller's next untap step."
+1 more matching line
Collector's Case90%
$0.25↑#26013↓0.300.3 years
"When this artifact enters, tap up to one target creature and put two stun counters on it."