Duelist's Heritage 

Enchantment
$2.09 #1282 0.24 9.8 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%
$0.18↓#10198↓0.151.9 years↓
"Whenever you attack, target attacking creature gains double strike until end of turn."
Headlong Rush80%
$0.18↓#28235↓0.00↓27.9 years↑
"Attacking creatures gain first strike until end of turn."
Chocobo Knights78%
$0.32↓#4322↓0.35↑1.2 years↓
"Whenever you attack, creatures you control with counters on them gain double strike until end of turn."
Berserkers' Onslaught78%
$0.30↓#2377↓0.3111.4 years↑
"Attacking creatures you control have double strike."
Rafiq of the Many76%
$0.30↓#10681↓0.42↑17.9 years↑
"Whenever a creature you control attacks alone, it gains double strike until end of turn."
Goring Ceratops76%
$0.95↓#6416↓0.56↑8.9 years
"Whenever this creature attacks, other creatures you control gain double strike until end of turn."
Blood Mist76%
$0.16↓#8961↓0.3310.1 years
"At the beginning of combat on your turn, target creature you control gains double strike until end of turn."
Paladin Class74%
$0.41↓#4687↓0.40↑5.1 years↓
"Whenever you attack, until end of turn, target attacking creature gets +1/+1 for each other attacking creature and gains double strike."
Urdnan, Dromoka Warrior74%
$0.37↓#7842↓0.13↓1.8 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."
Flaming Fist74%
$0.30↓#4988↓0.294.2 years↓
"Commander creatures you own have "Whenever this creature attacks, it gains double strike until end of turn.""
Akki Coalflinger74%
$0.11↓#19966↓0.00↓21.9 years↑
"
,
: Attacking creatures gain first strike until end of turn."
Assault Strobe74%
$0.41↓#8520↓0.2515.9 years↑
"Target creature gains double strike until end of turn."
Avenging Huntbonder74%
$0.25↓#13605↓0.12↓6.4 years↓
"Whenever this creature attacks, put a double strike counter on another target attacking creature."
Reyav, Master Smith72%
$0.27↓#2814↓0.08↓5.8 years↓
"Whenever a creature you control that's enchanted or equipped attacks, that creature gains double strike until end of turn."
War Machine, Avenging Arsenal72%
$0.35↓#12141↓0.00↓0.2 years↓
"Whenever this card attacks, attacking modified creatures you control gain double strike until end of turn."
Marshal of the Lost72%
$0.21↓#12418↓0.211.4 years↓
"Whenever you attack, target creature gets +X/+X until end of turn, where X is the number of attacking creatures."
Squall, SeeD Mercenary72%
$1.18↓#3679↓0.34↑1.2 years↓
"Whenever a creature you control attacks alone, it gains double strike until end of turn."