Cool but Rude 

Enchantment — Class
$7.10 #4950 0.00 0.5 years
(Gain the next level as a sorcery to add its ability.)
Whenever you attack, you may discard a card. If you do, draw a card.
Whenever you discard a card, this Class deals 2 damage to each opponent.
When this Class becomes level 3, search your library for a card, put it into your hand, shuffle, then discard a card at random.
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Cards similar to Cool but Rude 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.
Glint-Horn Buccaneer94%
$9.73↑#2019↑0.40↑7.2 years↑
"Whenever you discard a card, this creature deals 1 damage to each opponent."
+1 more matching line
Veronica, Dissident Scribe84%
$0.36↓#8781↓0.11↑2.5 years↑
"Whenever this card attacks, you may discard a card. If you do, draw a card."
Magmakin Artillerist84%
$0.21↓#3132↑0.24↑1.6 years↑
"Whenever you discard one or more cards, this creature deals that much damage to each opponent."
+1 more matching line
Fervent Mastery82%
$0.29↓#12487↓0.20↑5.4 years↑
"Search your library for up to three cards, put them into your hand, shuffle, then discard three cards at random."
+1 more matching line
Green Goblin, Revenant81%
$0.26↓#7693↓0.38↑1.0 years
"Whenever this card attacks, discard a card. Then draw a card for each card you've discarded this turn."
Gamble81%
$15.62↑#240↑0.76↑27.9 years↑
"Search your library for a card, put that card into your hand, discard a card at random, then shuffle."
Banon, the Returners' Leader80%
$0.29↓#6741↓0.18↑1.2 years
"Whenever you attack, you may pay
and discard a card. If you do, draw a card."
Conspiracy Theorist79%
$0.28↓#43740.12↑5.4 years↑
"Whenever this creature attacks, you may pay
and discard a card. If you do, draw a card."
Brallin, Skyshark Rider78%
$4.76↓#46470.31↑6.4 years↑
"Whenever you discard a card, put a +1/+1 counter on this card and it deals 1 damage to each opponent."
Null Group Biological Assets78%
$0.05↓#25227↓0.000.5 years
"Whenever this creature attacks, you may discard a card. If you do, draw a card."
Burning-Tree Vandal78%
$0.09↓#21486↓0.067.6 years↑
"Whenever this creature attacks, you may discard a card. If you do, draw a card."
Vaultbreaker76%
$0.06↓#24875↓0.0011.6 years↑
"Whenever this creature attacks, you may discard a card. If you do, draw a card."
Loch Dragon75%
$0.22↓#21243↓0.57↑6.9 years↑
"Whenever this creature enters or attacks, you may discard a card. If you do, draw a card."
Restless Vents73%
$0.34↓#51270.052.8 years↑
"Whenever this land attacks, you may discard a card. If you do, draw a card."
Shadow of the Goblin73%
$0.73↓#43190.23↑1.0 years
"At the beginning of your first main phase, discard a card. If you do, draw a card."
+1 more matching line
Curse of Chaos73%
$0.38↓#14183↓0.12↑12.8 years↑
"Whenever a player attacks enchanted player with one or more creatures, that attacking player may discard a card. If the player does, they draw a card."
Astonishing Spider-Man72%
$0.65↓#19085↓0.000.2 years
"Whenever this card attacks, you may discard your hand. If you do, draw a card for each card you've discarded this turn."
Rune-Scarred Demon72%
$0.80↓#1293↑0.54↑15.1 years↑
"When this creature enters, search your library for a card, put it into your hand, then shuffle."
Misty Knight, Hero for Hire72%
$0.14↓#15642↓0.000.2 years
"
,
, Discard a card: Draw a card for each card you've discarded this turn."