Shackle Slinger 
Creature — Human Soldier
$0.25 #15922 0.41 2.5 years
Whenever you cast your second spell each turn, choose target creature an opponent controls. If it's tapped, put a stun counter on it. Otherwise, tap it. (If a permanent with a stun counter would become untapped, remove one from it instead.)
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Cards similar to Shackle Slinger 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.
Wavecrash Triton85%
$0.12↓#26629↓0.13↓13.1 years↑
"Whenever you cast a spell that targets this creature, tap target creature an opponent controls. That creature doesn't untap during its controller's next untap step."
Quiet Contemplation85%
$0.20↓#190520.55↑12.1 years↑
"Whenever you cast a noncreature spell, you may pay 
. If you do, tap target creature an opponent controls and it doesn't untap during its controller's next untap step."
. If you do, tap target creature an opponent controls and it doesn't untap during its controller's next untap step."
Ultros, Obnoxious Octopus80%
$0.21↓#146620.361.4 years↓
"Whenever you cast a noncreature spell, if at least four mana was spent to cast it, tap target creature an opponent controls and put a stun counter on it."
Tranquilize80%
$0.14↓#132450.26↓2.3 years
"Tap target creature an opponent controls and put three stun counters on it."
Petrifying Meddler80%
$0.10↓#20372↓0.14↓2.3 years
"When you cast this spell, tap up to one target creature and put a stun counter on it."
Procrastinate80%
$0.18↓#12678↑0.23↓0.5 years↓
"Tap target creature. Put twice X stun counters on it."
Rowdy Snowballers80%
$0.10↓#138240.17↓0.9 years↓
"When this creature enters, tap target creature an opponent controls and put a stun counter on it."
Alchemax Slayer-Bots80%
$0.19↓#180340.431.1 years↓
"When this creature enters, tap target creature an opponent controls and put a stun counter on it."
Shipwreck Patrol80%
$0.21↓#29666↓0.16↓0.3 years↓
"When this creature enters, tap target creature an opponent controls and put a stun counter on it."
Fractal Mascot80%
$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 Immobility80%
$0.13↓#176540.25↓2.1 years
"When this creature enters, tap up to one target creature. If an opponent controls that creature, put a stun counter on it."
Utrom Scientists80%
$0.06↓#21901↓0.310.6 years↓
"When this creature enters, tap up to one target creature and put a stun counter on it."
Sharktocrab79%
$0.20↓#147740.19↓7.7 years↑
"Whenever one or more +1/+1 counters are put on this creature, tap target creature an opponent controls. That creature doesn't untap during its controller's next untap step."
Galvanic Giant // Storm Reading78%
$0.23↓#12526↑0.383.1 years
"Whenever you cast a spell with mana value 5 or greater, tap target creature an opponent controls and put a stun counter on it."
Celestial Regulator77%
$0.12↓#22266↓0.00↓4.5 years↑
"When this creature enters, choose target creature you don't control and tap it. If you control a creature with a counter on it, the chosen creature doesn't untap during its controller's next untap step."
Collector's Case77%
$0.25#26013↓0.30↓0.3 years↓
"When this artifact enters, tap up to one target creature and put two stun counters on it."
Wayspeaker Bodyguard76%
$0.11↓#21798↓0.00↓1.5 years
"Whenever you cast your second spell each turn, tap target creature an opponent controls."
Niblis of Frost76%
$0.37↑#8253↑0.62↑10.2 years↑
"Whenever you cast an instant or sorcery spell, tap target creature an opponent controls. That creature doesn't untap during its controller's next untap step."
Rapier Wit76%
$0.16↓#152480.20↓0.5 years↓
"Tap target creature. If it's your turn, put a stun counter on it."
Donatello, Rad Scientist76%
$0.35↑#187000.450.6 years↓
"When this card enters, tap up to three target creatures your opponents control. Put a stun counter on each of them."