Duelist's Heritage 

Enchantment
$2.48 #1283 0.27 9.9 years
Whenever one or more creatures attack, you may have target attacking creature gain double strike until end of turn.
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Cards similar to Duelist's Heritage 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.
Ticket Booth // Tunnel of Hate85%
$0.12↓#11036↓0.07↓2.1 years↓
"Whenever you attack, target attacking creature gains double strike until end of turn."
Headlong Rush80%
$0.19↓#28397↓0.1928.0 years↑
"Attacking creatures gain first strike until end of turn."
Berserkers' Onslaught78%
$0.37↓#2416↓0.3711.6 years↑
"Attacking creatures you control have double strike."
Goring Ceratops76%
$0.77↓#6487↓0.12↓9.1 years
"Whenever this creature attacks, other creatures you control gain double strike until end of turn."
Blood Mist76%
$0.16↓#9095↓0.2910.2 years
"At the beginning of combat on your turn, target creature you control gains double strike until end of turn."
Chocobo Knights76%
$0.31↓#4184↓0.53↑1.4 years↓
"Whenever you attack, creatures you control with counters on them gain double strike until end of turn."
Akki Coalflinger75%
$0.10↓#20228↓0.06↓22.1 years↑
"
,
: Attacking creatures gain first strike until end of turn."
Paladin Class74%
$0.41↓#4787↓0.56↑5.2 years↓
"Whenever you attack, until end of turn, target attacking creature gets +1/+1 for each other attacking creature and gains double strike."
Rafiq of the Many74%
$0.31↓#10982↓0.2618.0 years↑
"Whenever a creature you control attacks alone, it gains double strike until end of turn."
Flaming Fist74%
$0.26↓#5141↓0.314.4 years↓
"Commander creatures you own have "Whenever this creature attacks, it gains double strike until end of turn.""
Blade Historian74%
$4.85↑#2721↓0.46↑5.5 years↓
"Attacking creatures you control have double strike."
Assault Strobe74%
$0.50↓#8605↓0.06↓16.1 years↑
"Target creature gains double strike until end of turn."
Avenging Huntbonder74%
$0.27↓#13916↓0.216.5 years↓
"Whenever this creature attacks, put a double strike counter on another target attacking creature."
Marshal of the Lost72%
$0.20↓#12488↓0.12↓1.5 years↓
"Whenever you attack, target creature gets +X/+X until end of turn, where X is the number of attacking creatures."
Urdnan, Dromoka Warrior72%
$0.34↓#7707↓0.00↓1.9 years↓
"Whenever you attack, target attacking creature with a +1/+1 counter on it gains first strike until end of turn. If that creature has two or more +1/+1 counters on it, it gains double strike until end of turn instead."
Double Cleave72%
$0.22↓#16622↓0.1818.2 years↑
"Target creature gains double strike until end of turn."
Squall, SeeD Mercenary72%
$1.58↓#3550↓0.201.4 years↓
"Whenever a creature you control attacks alone, it gains double strike until end of turn."
Chaos Terminator Lord72%
$0.43↓#11451↓0.354.0 years↓
"At the beginning of combat on your turn, another target creature you control gains double strike until end of turn."