Spider-Man, Web-Spinner 

Legendary Creature — Spider Human Hero
Double strike (This creature deals both first-strike and regular combat damage.)
Haste (This creature can attack and {T} as soon as he comes under your control.)
Whenever Spider-Man attacks, target creature can't block this turn.
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Cards that do something similar 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.
Plasma Jockey 90%
$0.12#21759
"Whenever this creature attacks, target creature an opponent controls can't block this turn."
Clamor Shaman 90%
$0.13#19472
"Whenever this creature attacks, target creature an opponent controls can't block this turn."
Grotag Thrasher 90%
$0.11#27970
"Whenever this creature attacks, target creature can't block this turn."
Goblin Heelcutter 90%
$0.08#20211
"Whenever this creature attacks, target creature can't block this turn."
Mardu Roughrider 90%
$0.10#24229
"Whenever this creature attacks, target creature can't block this turn."
Goma Fada Vanguard 89%
$0.09#15871
"Whenever this creature attacks, target creature an opponent controls with power less than or equal to the number of Warriors you control can't block this turn."
Gilded Cerodon 87%
$0.04#27831
"Whenever this creature attacks, if you control a Desert or there is a Desert card in your graveyard, target creature can't block this turn."
Radha's Firebrand 87%
$0.18#21319
"Whenever this creature attacks, target creature defending player controls with power less than this creature's power can't block this turn."
Aragorn, King of Gondor 86%
$0.73#4070
"Whenever this card attacks, up to one target creature can't block this turn. If you're the monarch, creatures can't block this turn."
Goblin Locksmith 84%
$0.14#23691
"Whenever this creature attacks, creatures with defender can't block this turn."
Grappling Hook 81%
$1.13#9891
"Whenever equipped creature attacks, you may have target creature block it this turn if able."
King T'Challa // Black Panther, Hope Enduring 100%
$14.78#11166
"Double strike"
+1 more matching line