Grotag Thrasher 

Creature — Lizard
$0.11 #29030 0.00 16.7 years
Whenever this creature attacks, target creature can't block this turn.
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Cards similar to Grotag Thrasher 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.
Mardu Roughrider100%
$0.11#251580.0412.1 years↓
"Whenever this creature attacks, target creature can't block this turn."
Spider-Man, Web-Spinner100%
$10.04↑#19457↑0.33↑0.3 years↓
"Whenever this card attacks, target creature can't block this turn."
Frenzied Goblin98%
$0.08↓#9591↑0.27↑21.2 years↑
"Whenever this creature attacks, you may pay
. If you do, target creature can't block this turn."
Clamor Shaman96%
$0.15↑#20224↑0.31↑7.7 years↓
"Whenever this creature attacks, target creature an opponent controls can't block this turn."
Plasma Jockey94%
$0.13↑#22697↑0.064.5 years↓
"Whenever this creature attacks, target creature an opponent controls can't block this turn."
Goblin Heelcutter92%
$0.09↓#20796↑0.0011.7 years↓
"Whenever this creature attacks, target creature can't block this turn."
Firefist Striker92%
$0.10↓#256370.0013.7 years↓
"Whenever this creature and at least two other creatures attack, target creature can't block this turn."
Labyrinth Adversary87%
$0.16↑#20569↑0.35↑2.3 years↓
"Whenever you attack, you may pay 
. When you do, target creature can't block this turn."
Ty Lee, Artful Acrobat86%
$0.19↑#11539↑0.11↑0.9 years↓
"Whenever this card attacks, you may pay
. When you do, target creature can't block this turn."
Burrenton Shield-Bearers86%
$0.19↑#303510.0618.7 years↑
"Whenever this creature attacks, target creature gets +0/+3 until end of turn."
Duct Crawler86%
$0.02↓#312420.0628.6 years↑
"
: Target creature can't block this creature this turn."
Maulfist Doorbuster85%
$0.07↓#266840.13↑10.1 years↓
"Whenever this creature attacks, you may pay
. If you do, target creature can't block this turn."
Gilded Cerodon85%
$0.03↓#285000.67↑9.3 years↓
"Whenever this creature attacks, if you control a Desert or there is a Desert card in your graveyard, target creature can't block this turn."
Kozilek's Pathfinder85%
$0.09↓#20171↑0.55↑10.7 years↓
"
: Target creature can't block this creature this turn."
Unstoppable Ogre84%
$0.11#246020.054.7 years↓
"When this creature enters, target creature can't block this turn."
Summit Intimidator84%
$0.09↓#250370.001.5 years↓
"When this creature enters, target creature can't block this turn."