Momentum Rumbler 

Creature — Dinosaur
$0.20 #22257 0.19 6.4 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%
$0.07↓#28862↓0.00↓10.6 years↑
"This creature has first strike as long as it's attacking."
Triumphant Adventurer80%
$0.32↑#9022↑0.73↑5.1 years↓
"During your turn, this creature has first strike."
Ordruun Veteran80%
$0.06↓#27318↓0.00↓13.6 years↑
"Whenever this creature and at least two other creatures attack, this creature gains double strike until end of turn."
Ragefire Hellkite80%
$0.24↑#198020.53↑4.0 years↓
"Whenever this creature attacks, you may sacrifice another creature. If you do, this creature gains double strike until end of turn."
Sanctuary Raptor78%
$0.15↓#258450.275.2 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%
$0.19↓#12528↑0.76↑2.2 years↓
"Whenever this card attacks, put a +1/+1 counter on it."
Soltari Lancer76%
$0.22↑#239610.1928.9 years↑
"This creature has first strike as long as it's attacking."
Thorned Moloch76%
$0.17↓#259430.00↓9.1 years↑
"This creature has first strike as long as it's attacking."
Wojek Halberdiers76%
$0.07↓#248500.00↓13.6 years↑
"Whenever this creature and at least two other creatures attack, this creature gains first strike until end of turn."
Fresh-Faced Recruit76%
$0.07↓#246800.00↓7.9 years↑
"During your turn, this creature has first strike."
Fallaji Chaindancer76%
$0.06↓#29351↓0.283.8 years↓
"
: This creature gains double strike until end of turn."
Voldaren Stinger75%
$0.16↓#196230.224.9 years↓
"This creature has first strike as long as it's attacking."
Blood Petal Celebrant74%
$0.08↓#13488↑0.264.8 years↓
"This creature has first strike as long as it's attacking."
Two-Headed Giant74%
$0.23↑#14112↑0.208.4 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."
Prickleboar74%
$0.06↓#29235↓0.57↑11.1 years↑
"During your turn, this creature gets +2/+0 and has first strike."
Null Group Biological Assets74%
$0.05↓#252270.00↓0.5 years↓
"During your turn, this creature has first strike."