Ahn-Crop Crasher 

Creature — Minotaur Warrior
$0.20 #17129 0.00 9.4 years
Haste (This creature can attack and
as soon as it comes under your control.)
You may exert this creature as it attacks. When you do, target creature can't block this turn. (An exerted creature won't untap during your next untap step.)
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Cards similar to Ahn-Crop Crasher 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.
Hooded Brawler86%
$0.07↓#28662↓0.44↑9.4 years
"You may exert this creature as it attacks. When you do, it gets +2/+2 until end of turn."
Nef-Crop Entangler86%
$0.03↓#28163↓0.099.4 years
"You may exert this creature as it attacks. When you do, it gets +1/+2 until end of turn."
Labyrinth Adversary86%
$0.11↓#201790.84↑2.2 years↓
"Whenever you attack, you may pay 
. When you do, target creature can't block this turn."
Khenra Scrapper84%
$0.07↓#27981↓1.07↑9.1 years
"You may exert this creature as it attacks. When you do, it gets +2/+0 until end of turn."
Ty Lee, Artful Acrobat82%
$0.23↑#11607↑0.000.8 years↓
"Whenever this card attacks, you may pay
. When you do, target creature can't block this turn."
Mardu Roughrider82%
$0.13↓#24795↓0.0011.9 years↑
"Whenever this creature attacks, target creature can't block this turn."
Grotag Thrasher82%
$0.11↓#28739↓0.27↑16.6 years↑
"Whenever this creature attacks, target creature can't block this turn."
Spider-Man, Web-Spinner82%
$8.83↑#20639↓0.000.2 years↓
"Whenever this card attacks, target creature can't block this turn."
+1 more matching line
Frenzied Goblin82%
$0.08↓#9574↑0.25↑21.0 years↑
"Whenever this creature attacks, you may pay
. If you do, target creature can't block this turn."
Plasma Jockey79%
$0.12↓#22331↓0.004.4 years↓
"Whenever this creature attacks, target creature an opponent controls can't block this turn."
Goblin Heelcutter78%
$0.10↓#205110.26↑11.6 years↑
"Whenever this creature attacks, target creature can't block this turn."