Cool but Rude 

Enchantment — Class
$6.02 #4396 0.43 0.6 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 Buccaneer93%
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"Whenever you discard a card, this creature deals 1 damage to each opponent."
+1 more matching line
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$0.69↓#14797↓0.32↓0.0 years
"When this creature enters, search your library for a card, put it into your hand, shuffle, then discard a card at random."
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"Search your library for a card, put that card into your hand, discard a card at random, then shuffle."
Fervent Mastery84%
$0.29↓#12545↓0.12↓5.5 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
Veronica, Dissident Scribe82%
$0.34↓#8894↓0.28↓2.6 years↑
"Whenever this card attacks, you may discard a card. If you do, draw a card."
Magmakin Artillerist82%
$0.30↓#3010↑0.17↓1.7 years↑
"Whenever you discard one or more cards, this creature deals that much damage to each opponent."
+1 more matching line
Green Goblin, Revenant80%
$0.31↓#7425↓0.06↓1.1 years
"Whenever this card attacks, discard a card. Then draw a card for each card you've discarded this turn."
Banon, the Returners' Leader80%
$0.21↓#6527↓0.10↓1.4 years
"Whenever you attack, you may pay
and discard a card. If you do, draw a card."
Tinybones, Pocket Nuisance78%
$0.22↓#14303↓0.58↑0.0 years
"Whenever a player discards one or more cards, this card deals 1 damage to each opponent."
Conspiracy Theorist78%
$0.26↓#43720.13↓5.5 years↑
"Whenever this creature attacks, you may pay
and discard a card. If you do, draw a card."
Null Group Biological Assets78%
$0.06↓#24899↓0.24↓0.6 years
"Whenever this creature attacks, you may discard a card. If you do, draw a card."
Burning-Tree Vandal78%
$0.09↓#21667↓0.06↓7.7 years↑
"Whenever this creature attacks, you may discard a card. If you do, draw a card."
Brallin, Skyshark Rider78%
$4.21↓#46590.15↓6.5 years↑
"Whenever you discard a card, put a +1/+1 counter on this card and it deals 1 damage to each opponent."
Jiang Yanggu, Alone75%
$0.18↓#23424↓0.09↓0.0 years
"Whenever a creature you control attacks a player alone, discard a card, then draw a card. Then put a +1/+1 counter on that creature for each card you've discarded this turn."
Vaultbreaker74%
$0.06↓#25238↓0.00↓11.7 years↑
"Whenever this creature attacks, you may discard a card. If you do, draw a card."
Loch Dragon74%
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"Whenever this creature enters or attacks, you may discard a card. If you do, draw a card."
Wild Research74%
$1.69↓#16348↓0.00↓25.4 years↑
"
: Search your library for an instant card and reveal that card. Put it into your hand, then discard a card at random. Then shuffle."
Gallia of the Endless Dance74%
$0.22↓#17036↓0.06↓6.7 years↑
"Whenever you attack with three or more creatures, you may discard a card at random. If you do, draw two cards."
Restless Vents72%
$0.23↓#5325↓0.03↓2.9 years↑
"Whenever this land attacks, you may discard a card. If you do, draw a card."