Aphelia, Viper Whisperer 

Legendary Creature — Gorgon Assassin
$19.08 #9646 0.54 1.8 years
Deathtouch
Whenever Aphelia attacks, you may pay 
. If you do, create a 1/1 black Snake creature token with deathtouch.
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Cards similar to Aphelia, Viper Whisperer 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.
Carefree Swinemaster74%
$0.13↓#23427↓0.31↓4.2 years↑
"Whenever this creature attacks, you may pay 
. If you do, create a 2/2 green Boar creature token that's tapped and attacking."
Radioactive Man74%
$0.30↓#22272↓0.00↓0.2 years↓
"Whenever this card deals combat damage to a player, that player loses half their life, rounded up."
+1 more matching line
Shredder, Shadow Master72%
$1.60↓#5885↑0.00↓0.5 years↓
"Whenever this card deals combat damage to a player, that player loses half their life, rounded up."
Hanweir, the Writhing Township71%
10.1 years↑
"Whenever this card attacks, create two 3/2 colorless Eldrazi Horror creature tokens that are tapped and attacking."
Skyknight Vanguard70%
$0.33↓#3853↑0.22↓7.2 years↑
"Whenever this creature attacks, create a 1/1 white Soldier creature token that's tapped and attacking."
Hanweir Garrison70%
$1.31↓#4252↑0.20↓10.1 years↑
"Whenever this creature attacks, create two 1/1 red Human creature tokens that are tapped and attacking."