Unexpected Windfall {2}{R}{R}
Instant
As an additional cost to cast this spell, discard a card.
Draw two cards and create two Treasure tokens. (They're artifacts with "{T}, Sacrifice this token: Add one mana of any color.")
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Cards that do something similar 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.
Pirate's Pillage 100%
$1.25#1664
"Draw two cards and create two Treasure tokens."
+1 more matching line
Grab the Prize 100%
$0.34#1473
"As an additional cost to cast this spell, discard a card."
+1 more matching line
Honor the God-Pharaoh 100%
$0.24#14464
"As an additional cost to cast this spell, discard a card."
+1 more matching line
Quarrel's End 100%
$0.16#10430
"As an additional cost to cast this spell, discard a card."
+1 more matching line
Sazacap's Brew 100%
$0.17#3920
"As an additional cost to cast this spell, discard a card."
+1 more matching line
Acceptable Losses 93%
$0.08#28885
"As an additional cost to cast this spell, discard a card at random."
Artist's Talent 91%
$5.86#1572
"Whenever you cast a noncreature spell, you may discard a card. If you do, draw a card."
Ral and the Implicit Maze 89%
$0.09#18773
"You may discard a card. If you do, exile the top two cards of your library. You may play them until the end of your next turn."
Hazoret's Monument 89%
$3.44#1878
"Whenever you cast a creature spell, you may discard a card. If you do, draw a card."