Niblis of the Urn 

Creature — Spirit
$0.23 #14080 0.19 14.6 years
Flying
Whenever this creature attacks, you may tap target creature.
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Cards similar to Niblis of the Urn 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.
War Machine, James Rhodes100%
$0.23#28044↓0.00↓0.2 years↓
"Whenever this card attacks, tap up to one target creature."
Alaborn Cavalier100%
$0.18↓#25073↓0.00↓28.2 years↑
"Whenever this creature attacks, you may tap target creature."
Flanking Troops100%
$2.75↑#30605↓0.00↓27.3 years↑
"Whenever this creature attacks, you may tap target creature."
Seasoned Marshal100%
$0.09↓#29886↓0.07↓29.3 years↑
"Whenever this creature attacks, you may tap target creature."
Territorial Hammerskull100%
$0.16↓#17850↓0.288.9 years↓
"Whenever this creature attacks, tap target creature an opponent controls."
Star-Crowned Stag99%
$0.05↓#26103↓0.198.1 years↓
"Whenever this creature attacks, tap target creature defending player controls."
Master of Diversion99%
$0.04↓#27139↓0.2413.1 years↓
"Whenever this creature attacks, tap target creature defending player controls."
Fiend Binder99%
$0.04↓#28014↓0.07↓10.1 years↓
"Whenever this creature attacks, tap target creature defending player controls."
Haazda Snare Squad98%
$0.05↓#28107↓0.2913.3 years↓
"Whenever this creature attacks, you may pay
. If you do, tap target creature an opponent controls."
Cho-Arrim Bruiser96%
$0.45↑#27878↓0.44↑26.9 years↑
"Whenever this creature attacks, you may tap up to two target creatures."
Sidar Jabari94%
$0.75↑#26631↓0.39↑29.9 years↑
"Whenever this card attacks, tap target creature defending player controls."
Distracting Geist // Clever Distraction94%
$0.11↓#20870↓0.67↑4.8 years↓
"Whenever this creature attacks, tap target creature defending player controls."
Tidus, Blitzball Star92%
$0.18↓#127820.38↑1.2 years↓
"Whenever this card attacks, tap target creature an opponent controls."
Rhox Veteran90%
$0.16↓#24303↓0.55↑7.2 years↓
"Whenever this creature attacks, tap target creature an opponent controls."
The Wasp, Winsome Avenger89%
$0.24↑#151720.00↓0.2 years↓
"Whenever this card attacks, tap target creature defending player controls."
Bola Slinger88%
$0.06↓#21368↓0.153.4 years↓
"Whenever this creature attacks, tap target artifact or creature an opponent controls."
Thousand Moons Crackshot88%
$0.08↓#26733↓0.56↑2.8 years↓
"Whenever this creature attacks, you may pay 
. When you do, tap target creature."
Harrier Griffin88%
$0.12↓#25434↓0.33↑20.6 years↑
"At the beginning of your upkeep, tap target creature."