Momentum Rumbler 
Creature — Dinosaur
$0.19 #22539 0.19 6.5 years
Whenever this creature attacks, if it doesn't have first strike, put a first strike counter on it.
Whenever this creature attacks, if it has first strike, it gains double strike until end of turn.
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Cards similar to Momentum Rumbler 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.
Kor Scythemaster81%
$0.04↓#29200↓0.07↓10.7 years↑
"This creature has first strike as long as it's attacking."
Triumphant Adventurer80%
$0.36↑#9236↑0.00↓5.2 years↓
"During your turn, this creature has first strike."
Ordruun Veteran78%
$0.08↓#27559↓0.00↓13.7 years↑
"Whenever this creature and at least two other creatures attack, this creature gains double strike until end of turn."
Ragefire Hellkite78%
$0.24↑#200700.124.1 years↓
"Whenever this creature attacks, you may sacrifice another creature. If you do, this creature gains double strike until end of turn."
Sanctuary Raptor77%
$0.16↓#261840.00↓5.3 years↓
"Whenever this creature attacks, if you control three or more tokens, this creature gets +2/+0 and gains first strike until end of turn."
Ezio, Brash Novice76%
$0.21↑#13012↑0.182.3 years↓
"Whenever this card attacks, put a +1/+1 counter on it."
Sanctuary Smasher76%
$0.21↑#197400.106.5 years
"First strike"
Gallant Pie-Wielder76%
$0.16↓#248760.07↓3.1 years↓
"First strike"
Chieftain en-Dal76%
$0.21↑#261830.06↓26.7 years↑
"Whenever this creature attacks, attacking creatures gain first strike until end of turn."
Soltari Lancer75%
$0.21↑#241990.06↓29.0 years↑
"This creature has first strike as long as it's attacking."
Thorned Moloch75%
$0.18↓#263390.119.3 years↑
"This creature has first strike as long as it's attacking."
Wojek Halberdiers75%
$0.13↓#252390.05↓13.7 years↑
"Whenever this creature and at least two other creatures attack, this creature gains first strike until end of turn."
Fresh-Faced Recruit75%
$0.07↓#250890.05↓8.0 years↑
"During your turn, this creature has first strike."
Pouncing Lynx75%
$0.07↓#254210.217.5 years
"During your turn, this creature has first strike."
Voldaren Stinger74%
$0.20↑#198500.06↓5.1 years↓
"This creature has first strike as long as it's attacking."
Nori, Teller of Tales74%
$0.11↓#13179↑0.140.2 years↓
"Whenever this card attacks, target attacking creature gains first strike until end of turn."
Blood Petal Celebrant74%
$0.07↓#13582↑0.05↓4.9 years↓
"This creature has first strike as long as it's attacking."
Prickleboar74%
$0.05↓#29597↓0.00↓11.3 years↑
"During your turn, this creature gets +2/+0 and has first strike."
Fallaji Chaindancer74%
$0.04↓#29784↓0.00↓3.9 years↓
"
: This creature gains double strike until end of turn."
: This creature gains double strike until end of turn."
Two-Headed Giant74%
$0.26↑#14188↑0.228.5 years↑
"Whenever this creature attacks, flip two coins. If both coins come up heads, this creature gains double strike until end of turn. If both coins come up tails, this creature gains menace until end of turn."