Zygon Infiltrator 

Creature — Alien Shapeshifter Soldier
$0.27 #15538 0.12 3.0 years
Body-print — 
: Tap another target creature and put a stun counter on it. This creature becomes a copy of that creature for as long as that creature remains tapped. Activate only as a sorcery. (If a permanent with a stun counter would become untapped, remove one from it instead.)
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Cards similar to Zygon Infiltrator 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.
Kimahri, Valiant Guardian86%
$0.21↓#6902↑0.00↓1.4 years↓
"At the beginning of combat on your turn, put a +1/+1 counter on this card and tap target creature an opponent controls. Then you may have this card become a copy of that creature, except its name is this card and it has vigilance and this ability."
Cryptoplasm78%
$0.64↑#129380.44↑15.7 years↑
"At the beginning of your upkeep, you may have this creature become a copy of another target creature, except it has this ability."
Solitary Sanctuary77%
$0.30↑#8508↑0.29↑3.1 years
"When this enchantment enters, tap target creature an opponent controls and put a stun counter on it."
Sanctuary Wall76%
$0.23↓#182950.35↑2.7 years
"
,
: Tap target creature. You may put a stun counter on it. If you do, put a stun counter on this creature."
Tranquilize76%
$0.14↓#132450.26↑2.3 years
"Tap target creature an opponent controls and put three stun counters on it."
Summon: Shiva76%
$0.29↑#4901↑0.071.4 years↓
"Tap target creature an opponent controls. Put a stun counter on it."
Procrastinate76%
$0.18↓#126780.23↑0.5 years↓
"Tap target creature. Put twice X stun counters on it."
Utrom Scientists74%
$0.06↓#21901↓0.31↑0.6 years↓
"When this creature enters, tap up to one target creature and put a stun counter on it."
Alchemax Slayer-Bots74%
$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 Patrol74%
$0.21↓#29666↓0.160.3 years↓
"When this creature enters, tap target creature an opponent controls and put a stun counter on it."
Rowdy Snowballers74%
$0.10↓#138240.170.9 years↓
"When this creature enters, tap target creature an opponent controls and put a stun counter on it."
Sharae of Numbing Depths74%
$0.25↓#7472↑0.28↑3.1 years
"When Sharae enters, tap target creature an opponent controls and put a stun counter on it."
Fractal Mascot74%
$0.09↓#22254↓0.090.5 years↓
"When this creature enters, tap target creature an opponent controls. Put a stun counter on it."
Fear of Immobility73%
$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."
Loch Mare72%
$0.41↑#146690.120.7 years↓
"
, Remove two counters from this creature: Tap target creature. Put a stun counter on it."
Volrath, the Shapestealer72%
$0.67↑#137910.22↑7.2 years↑
"
: Until your next turn, this card becomes a copy of target creature with a counter on it, except it's 7/5 and it has this ability."