Fear of Immobility 
Enchantment Creature — Nightmare
$0.13 #17654 0.25 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. (If a permanent with a stun counter would become untapped, remove one from it instead.)
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Cards similar to Fear of Immobility 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.
Fractal Mascot100%
$0.09↓#22254↓0.09↓0.5 years↓
"When this creature enters, tap target creature an opponent controls. Put a stun counter on it."
Rowdy Snowballers100%
$0.10↓#13824↑0.170.9 years↓
"When this creature enters, tap target creature an opponent controls and put a stun counter on it."
Alchemax Slayer-Bots100%
$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 Patrol100%
$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 Scientists100%
$0.06↓#21901↓0.310.6 years↓
"When this creature enters, tap up to one target creature and put a stun counter on it."
Donatello, Rad Scientist97%
$0.35↑#187000.45↑0.6 years↓
"When this card enters, tap up to three target creatures your opponents control. Put a stun counter on each of them."
Gilded Scuttler96%
$0.34↑#13567↑0.06↓1.9 years
"When this creature enters, tap target creature an opponent controls and put a stun counter on it."
Stitched Mangler96%
$0.13#21336↓0.3110.5 years↑
"When this creature enters, tap target creature an opponent controls. That creature doesn't untap during its controller's next untap step."
Watertrap Weaver96%
$0.08↓#22463↓0.39↑9.1 years↑
"When this creature enters, tap target creature an opponent controls. That creature doesn't untap during its controller's next untap step."
Kor Hookmaster96%
$0.05↓#25885↓0.06↓17.0 years↑
"When this creature enters, tap target creature an opponent controls. That creature doesn't untap during its controller's next untap step."
Frost Lynx96%
$0.04↓#200630.2712.3 years↑
"When this creature enters, tap target creature an opponent controls. That creature doesn't untap during its controller's next untap step."
Collector's Case96%
$0.25↑#26013↓0.300.3 years↓
"When this artifact enters, tap up to one target creature and put two stun counters on it."
Spire Patrol96%
$0.05↓#28618↓0.04↓9.7 years↑
"When this creature enters, tap target creature an opponent controls. That creature doesn't untap during its controller's next untap step."
Frost Trickster96%
$0.10↓#178620.255.5 years↑
"When this creature enters, tap target creature an opponent controls. That creature doesn't untap during its controller's next untap step."
Chillbringer96%
$0.06↓#26268↓0.06↓7.7 years↑
"When this creature enters, tap target creature an opponent controls. It doesn't untap during its controller's next untap step."
Constrictor Sage96%
$0.11↓#21529↓0.06↓1.5 years
"When this creature enters, tap target creature an opponent controls and put a stun counter on it."
Tranquilize96%
$0.14↑#13245↑0.262.3 years
"Tap target creature an opponent controls and put three stun counters on it."
Solitary Sanctuary95%
$0.30↑#8508↑0.293.1 years↑
"When this enchantment enters, tap target creature an opponent controls and put a stun counter on it."
Procrastinate95%
$0.18↑#12678↑0.230.5 years↓
"Tap target creature. Put twice X stun counters on it."
Dreamdew Entrancer94%
$0.33↑#7051↑0.06↓2.2 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."