Sonic the Hedgehog 
Legendary Creature — Hedgehog Warrior
$3.64 #8890 0.47 1.3 years
Haste
Gotta Go Fast — Whenever Sonic the Hedgehog attacks, put a +1/+1 counter on each creature you control with flash or haste.
Whenever a creature you control with flash or haste is dealt damage, create a tapped Treasure token.
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Cards similar to Sonic the Hedgehog 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.
Ognis, the Dragon's Lash80%
$0.29↓#95140.19↓4.5 years↑
"Whenever a creature you control with haste attacks, create a tapped Treasure token."
+1 more matching line
Barging Sergeant78%
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"Haste"
Leatherhead, Iron Gator78%
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"Whenever this card attacks, put two +1/+1 counters on each creature you control."
Thundering Raiju77%
$0.43↓#4237↑0.20↓4.7 years↑
"Haste"
Cunning Nightbonder77%
$0.30↓#104150.62↑6.5 years↑
"Flash"
Cloud, Ex-SOLDIER75%
$0.51↓#4392↑0.73↑1.4 years
"Haste"
Laelia, the Blade Reforged72%
$0.34↓#1343↑0.27↓5.5 years↑
"Haste"
Rubblebelt Raiders72%
$0.13↓#18863↓0.00↓13.7 years↑
"Whenever this creature attacks, put a +1/+1 counter on it for each attacking creature you control."
Smaug the Impenetrable70%
$14.97↑#90091.00↑0.2 years↓
"Whenever Smaug is dealt noncombat damage, create that many Treasure tokens."
Thraximundar70%
$0.83↓#92670.61↑17.5 years↑
"Haste"
Fangren Firstborn70%
$2.18↓#15724↓0.26↓22.7 years↑
"Whenever this creature attacks, put a +1/+1 counter on each attacking creature."