Hard-Won Jitte 

Artifact — Equipment
$0.25 #13236 0.00 0.5 years
Equipped creature has double strike.
Equip
(
: Attach to target creature you control. Equip only as a sorcery.)
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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.
Fireshrieker94%
$0.21↓#1119↑0.14↑22.9 years↑
"Equipped creature has double strike."
+1 more matching line
Sidequest: Play Blitzball // World Champion, Celestial Weapon90%
$0.20↓#114000.33↑1.2 years
"Equipped creature gets +2/+0 and has double strike."
Cleaver Riot90%
$0.11↓#19894↓0.29↑14.1 years↑
"Creatures you control gain double strike until end of turn."
Assault Strobe89%
$0.41↑#8520↑0.25↑15.9 years↑
"Target creature gains double strike until end of turn."
Blood Mist88%
$0.16↓#8961↑0.33↑10.1 years↑
"At the beginning of combat on your turn, target creature you control gains double strike until end of turn."
Double Cleave87%
$0.22↓#16270↓0.14↑18.1 years↑
"Target creature gains double strike until end of turn."
Brass Knuckles86%
$0.20↓#4973↑0.094.4 years↑
"Equipped creature has double strike as long as two or more Equipment are attached to it."
+1 more matching line
Gavel of the Righteous86%
$0.27↑#5260↑0.28↑4.4 years↑
"As long as this Equipment has four or more counters on it, equipped creature has double strike."
Uncaged Fury86%
$0.11↓#118540.29↑10.4 years↑
"Target creature gets +1/+1 and gains double strike until end of turn."