Shackle Slinger 
Creature — Human Soldier
$0.23 #15701 0.00 2.4 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%
$0.13↓#26426↓0.18↑12.9 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%
$0.21↓#187010.88↑11.9 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%
$0.20↓#146960.47↑1.2 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%
$0.17↓#130610.57↑2.2 years
"Tap target creature an opponent controls and put three stun counters on it."
Petrifying Meddler80%
$0.13↓#19996↓0.062.2 years
"When you cast this spell, tap up to one target creature and put a stun counter on it."
Procrastinate80%
$0.20↓#134000.000.4 years↓
"Tap target creature. Put twice X stun counters on it."
Shipwreck Patrol80%
$0.17↓#30233↓0.000.2 years↓
"When this creature enters, tap target creature an opponent controls and put a stun counter on it."
Alchemax Slayer-Bots80%
$0.22↓#181290.17↑0.9 years↓
"When this creature enters, tap target creature an opponent controls and put a stun counter on it."
Rowdy Snowballers80%
$0.17↓#139930.000.8 years↓
"When this creature enters, tap target creature an opponent controls and put a stun counter on it."
Fractal Mascot80%
$0.13↓#22595↓0.000.4 years↓
"When this creature enters, tap target creature an opponent controls. Put a stun counter on it."
Fear of Immobility80%
$0.11↓#170420.18↑1.9 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%
$0.13↓#22162↓0.000.5 years↓
"When this creature enters, tap up to one target creature and put a stun counter on it."
Sharktocrab79%
$0.17↓#145860.36↑7.6 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%
$0.24↑#12211↑0.22↑3.0 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."
Rapier Wit77%
$0.20↓#160690.000.4 years↓
"Tap target creature. If it's your turn, put a stun counter on it."
Celestial Regulator77%
$0.16↓#21942↓0.14↑4.4 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%
$0.16↓#27215↓0.000.2 years↓
"When this artifact enters, tap up to one target creature and put two stun counters on it."
Wayspeaker Bodyguard76%
$0.10↓#21639↓0.20↑1.4 years
"Whenever you cast your second spell each turn, tap target creature an opponent controls."
Niblis of Frost76%
$0.37↑#8073↑0.25↑10.1 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."
Donatello, Rad Scientist76%
$0.38↑#18960↓0.000.5 years↓
"When this card enters, tap up to three target creatures your opponents control. Put a stun counter on each of them."