Grappling Hook 
Artifact — Equipment
$0.76 #10169 0.29 17.0 years
Equipped creature has double strike.
Whenever equipped creature attacks, you may have target creature block it this turn if able.
Equip 
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Cards similar to Grappling Hook 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.
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"Equipped creature has double strike."
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"Equipped creature has double strike."
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"
: Target creature blocks this creature this turn if able."
Fighter Class81%
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"
: Target creature blocks this creature this turn if able."
Impetuous Devils80%
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"When this creature attacks, up to one target creature defending player controls blocks it this combat if able."
Hunt Down80%
$0.20↓#27481↓0.14↓19.0 years↑
"Target creature blocks target creature this turn if able."
Fireshrieker80%
$0.21↓#1145↑0.15↓23.0 years↑
"Equipped creature has double strike."
+1 more matching line
Burning-Tree Bloodscale80%
$0.04↓#30319↓0.00↓21.2 years↑
"
: Target creature blocks this creature this turn if able."
Rover Blades78%
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"Equipped creature has double strike."
+1 more matching line
Tangle Angler78%
$0.21↓#20825↓0.3316.1 years
"
: Target creature blocks this creature this turn if able."
Rimehorn Aurochs78%
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"
: Target creature blocks target creature this turn if able."
Sidequest: Play Blitzball // World Champion, Celestial Weapon77%
$0.23↓#113340.53↑1.4 years↓
"Equipped creature gets +2/+0 and has double strike."
+1 more matching line
Giant Ambush Beetle77%
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"When this creature enters, you may have target creature block it this turn if able."