Protocol Knight 
Creature — Human Knight
$0.19 #24913 0.00 3.5 years
When this creature enters, tap target creature an opponent controls. Put a stun counter on that creature if you control another Knight. (If a permanent with a stun counter would become untapped, remove one from it instead.)
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Cards similar to Protocol Knight 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.
Utrom Scientists86%
$0.06↓#219010.31↑0.6 years↓
"When this creature enters, tap up to one target creature and put a stun counter on it."
Rowdy Snowballers86%
$0.10↓#13824↑0.17↑0.9 years↓
"When this creature enters, tap target creature an opponent controls and put a stun counter on it."
Alchemax Slayer-Bots86%
$0.19#18034↑0.43↑1.1 years↓
"When this creature enters, tap target creature an opponent controls and put a stun counter on it."
Shipwreck Patrol86%
$0.21↑#296660.16↑0.3 years↓
"When this creature enters, tap target creature an opponent controls and put a stun counter on it."
Fractal Mascot86%
$0.09↓#222540.090.5 years↓
"When this creature enters, tap target creature an opponent controls. Put a stun counter on it."
Fear of Immobility85%
$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."
Frost Lynx82%
$0.04↓#200630.27↑12.3 years↑
"When this creature enters, tap target creature an opponent controls. That creature doesn't untap during its controller's next untap step."
Stitched Mangler82%
$0.13↓#213360.31↑10.5 years↑
"When this creature enters, tap target creature an opponent controls. That creature doesn't untap during its controller's next untap step."
Watertrap Weaver82%
$0.08↓#224630.39↑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 Hookmaster82%
$0.05↓#258850.0617.0 years↑
"When this creature enters, tap target creature an opponent controls. That creature doesn't untap during its controller's next untap step."
Chillbringer82%
$0.06↓#262680.067.7 years↑
"When this creature enters, tap target creature an opponent controls. It doesn't untap during its controller's next untap step."
Frost Trickster82%
$0.10↓#17862↑0.25↑5.5 years↑
"When this creature enters, tap target creature an opponent controls. That creature doesn't untap during its controller's next untap step."
Spire Patrol82%
$0.05↓#286180.049.7 years↑
"When this creature enters, tap target creature an opponent controls. That creature doesn't untap during its controller's next untap step."
Donatello, Rad Scientist82%
$0.35↑#18700↑0.45↑0.6 years↓
"When this card enters, tap up to three target creatures your opponents control. Put a stun counter on each of them."
Tranquilize81%
$0.14↓#13245↑0.26↑2.3 years↓
"Tap target creature an opponent controls and put three stun counters on it."
Procrastinate80%
$0.18↓#12678↑0.23↑0.5 years↓
"Tap target creature. Put twice X stun counters on it."
Gilded Scuttler80%
$0.34↑#13567↑0.061.9 years↓
"When this creature enters, tap target creature an opponent controls and put a stun counter on it."
Dreamdew Entrancer80%
$0.33↑#7051↑0.062.2 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."
Collector's Case80%
$0.25↑#260130.30↑0.3 years↓
"When this artifact enters, tap up to one target creature and put two stun counters on it."
Constrictor Sage78%
$0.11↓#215290.061.5 years↓
"When this creature enters, tap target creature an opponent controls and put a stun counter on it."