Ophidian 

Creature — Snake
$0.12 #26531 0.25 29.2 years
Whenever this creature attacks and isn't blocked, you may draw a card. If you do, this creature assigns no combat damage this turn.
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Cards similar to Ophidian 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.
Eternal of Harsh Truths88%
$0.20↑#17782↑0.329.1 years↓
"Whenever this creature attacks and isn't blocked, draw a card."
Murk Dwellers84%
$0.06↓#315120.2032.1 years↑
"Whenever this creature attacks and isn't blocked, it gets +2/+0 until end of combat."
Neurok Commando82%
$0.08↓#18935↑0.15↓15.6 years↓
"Whenever this creature deals combat damage to a player, you may draw a card."
Scroll Thief82%
$0.06↓#17095↑0.36↑16.1 years↓
"Whenever this creature deals combat damage to a player, draw a card."
Nine-Tail White Fox82%
$0.21↑#220460.318.2 years↓
"Whenever this creature deals combat damage to a player, draw a card."
Marchesa's Infiltrator82%
$0.23↑#222160.3312.2 years↓
"Whenever this creature deals combat damage to a player, draw a card."
Stealer of Secrets82%
$0.05↓#20654↑0.2413.9 years↓
"Whenever this creature deals combat damage to a player, draw a card."
Sea-Dasher Octopus81%
$0.80↑#4721↑0.186.4 years↓
"Whenever this creature deals combat damage to a player, draw a card."
Deadeye Brawler80%
$0.28↑#19807↑0.338.6 years↓
"Whenever this creature deals combat damage to a player, if you have the city's blessing, draw a card."
Keeper of Tresserhorn80%
$0.64↑#314580.2530.2 years
"Whenever this creature attacks and isn't blocked, it assigns no combat damage this turn and defending player loses 2 life."
Elusive Tormentor // Insidious Mist78%
$0.21↑#20732↑0.07↓10.4 years↓
"Whenever this creature attacks and isn't blocked, you may pay 
. If you do, transform it."
Jeskai Shrinekeeper78%
$0.22↑#13623↑0.181.4 years↓
"Whenever this creature deals combat damage to a player, you gain 1 life and draw a card."
Coastal Piracy78%
$0.26↑#1510↑0.2026.9 years↓
"Whenever a creature you control deals combat damage to an opponent, you may draw a card."
Crypt Cobra76%
$0.16↑#284560.75↑29.9 years
"Whenever this creature attacks and isn't blocked, defending player gets a poison counter."
Mischievous Catgeist // Catlike Curiosity76%
$0.26↑#11872↑0.05↓4.8 years↓
"Whenever this creature deals combat damage to a player, draw a card."
Jhessian Thief76%
$0.12#19595↑0.00↓11.1 years↓
"Whenever this creature deals combat damage to a player, draw a card."
Lim-Dûl's Paladin76%
$0.26↑#289540.14↓30.2 years
"Whenever this creature attacks and isn't blocked, it assigns no combat damage this turn and defending player loses 4 life."
Stromgald Spy76%
$0.14↑#300240.69↑30.2 years
"Whenever this creature attacks and isn't blocked, you may have defending player play with their hand revealed for as long as this creature remains on the battlefield. If you do, this creature assigns no combat damage this turn."