Sonic the Hedgehog 
Legendary Creature — Hedgehog Warrior
$3.17 #9019 0.82 1.1 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%
$0.26↓#93130.39↓4.4 years↑
"Whenever a creature you control with haste attacks, create a tapped Treasure token."
+1 more matching line
Whirlwind, Killer Cyclone80%
$0.20↓#28303↓0.00↓0.2 years
"Haste"
Deathleaper, Terror Weapon78%
$0.53↓#11391↓0.11↓3.9 years↑
"Haste"
Prompto Argentum76%
$0.15↓#103220.24↓1.2 years
"Haste"
Leatherhead, Iron Gator76%
$0.30↓#92210.00↓0.5 years
"Whenever this card attacks, put two +1/+1 counters on each creature you control."
Iroh, Dragon of the West72%
$2.68↓#7130↑0.00↓0.8 years
"Haste"
Laelia, the Blade Reforged72%
$0.28↓#1316↑0.28↓5.4 years↑
"Haste"
Rubblebelt Raiders72%
$0.13↓#18440↓0.31↓13.6 years↑
"Whenever this creature attacks, put a +1/+1 counter on it for each attacking creature you control."
Smaug the Impenetrable72%
$22.47↑#11648↓0.00↓0.1 years↓
"Whenever Smaug is dealt noncombat damage, create that many Treasure tokens."
Fangren Firstborn70%
$2.32↓#15553↓0.17↓22.6 years↑
"Whenever this creature attacks, put a +1/+1 counter on each attacking creature."
Tilonalli's Skinshifter70%
$0.22↓#23306↓0.50↓8.9 years↑
"Haste"