Stall Out 
Sorcery
$0.20 #13987 0.23 1.6 years
Tap target creature or Vehicle, then put three stun counters on it. (If a permanent with a stun counter would become untapped, remove one from it instead.)
Cycling 
(, Discard this card: Draw a card.)
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Cards similar to Stall Out 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.
Howler's Heavy90%
$0.13↓#22071↓0.171.6 years
"Cycling , Discard this card: Draw a card."
, Discard this card: Draw a card."
Tranquilize90%
$0.17↓#130610.57↑2.2 years
"Tap target creature an opponent controls and put three stun counters on it."
Procrastinate90%
$0.20#134000.00↓0.4 years↓
"Tap target creature. Put twice X stun counters on it."
Imaginary Threats88%
$0.19↓#23453↓0.60↑9.1 years↑
"Cycling , Discard this card: Draw a card."
, Discard this card: Draw a card."
Rapier Wit87%
$0.20#160690.00↓0.4 years↓
"Tap target creature. If it's your turn, put a stun counter on it."
Press for Answers87%
$0.05↓#20217↓0.11↓10.4 years↑
"Tap target creature. It doesn't untap during its controller's next untap step."
Spectacular Pileup86%
$0.24↑#9380↑0.291.6 years
"Cycling , Discard this card: Draw a card."
, Discard this card: Draw a card."
Fractal Mascot86%
$0.13↓#22595↓0.00↓0.4 years↓
"When this creature enters, tap target creature an opponent controls. Put a stun counter on it."
Shipwreck Patrol86%
$0.17↓#30233↓0.00↓0.2 years↓
"When this creature enters, tap target creature an opponent controls and put a stun counter on it."
Alchemax Slayer-Bots86%
$0.22↑#18129↓0.170.9 years
"When this creature enters, tap target creature an opponent controls and put a stun counter on it."
Rowdy Snowballers86%
$0.17↓#139930.00↓0.8 years
"When this creature enters, tap target creature an opponent controls and put a stun counter on it."
Utrom Scientists86%
$0.13↓#22162↓0.00↓0.5 years↓
"When this creature enters, tap up to one target creature and put a stun counter on it."
Take into Custody86%
$0.05↓#23529↓0.279.6 years↑
"Tap target creature. It doesn't untap during its controller's next untap step."
Fear of Immobility85%
$0.11↓#17042↓0.181.9 years
"When this creature enters, tap up to one target creature. If an opponent controls that creature, put a stun counter on it."
Impede Momentum84%
$0.21↑#124590.38↑4.0 years↑
"Tap target creature and put three stun counters on it."
Succumb to the Cold84%
$0.25↑#10555↑0.143.0 years↑
"Tap one or two target creatures an opponent controls. Put a stun counter on each of them."
Crippling Chill84%
$0.03↓#19745↓0.12↓14.3 years↑
"Tap target creature. It doesn't untap during its controller's next untap step."
Frostveil Ambush84%
$0.13↓#20676↓0.12↓6.4 years↑
"Tap up to two target creatures. Those creatures don't untap during their controller's next untap step."
+1 more matching line
Dreamdew Entrancer84%
$0.32↑#6904↑0.47↑2.1 years
"When this creature enters, tap up to one target creature and put three stun counters on it. If you control that creature, draw two cards."
Riverwheel Sweep82%
$0.19↓#20572↓0.241.4 years
"Tap target creature. Put three stun counters on it."