Widespread Thieving 

Enchantment
Hideaway 5 (When this enchantment enters, look at the top five cards of your library, exile one face down, then put the rest on the bottom in a random order.)
Whenever you cast a multicolored spell, create a Treasure token. Then you may pay {W}{U}{B}{R}{G}. If you do, you may play the exiled card without paying its mana cost.
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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.
Gonti, Night Minister 82%
$1.25#2622
"Whenever a player casts a spell they don't own, that player creates a Treasure token."
Prompto Argentum 82%
$0.15#10631
"Whenever you cast a noncreature spell, if at least four mana was spent to cast it, create a Treasure token."
Glóin, Dwarf Emissary 82%
$0.88#3028
"Whenever you cast a historic spell, create a Treasure token. This ability triggers only once each turn."
Monologue Tax 81%
#1178
"Whenever an opponent casts their second spell each turn, you create a Treasure token."
Olivia, Opulent Outlaw 81%
$5.33#4740
"Whenever one or more outlaws you control deal combat damage to a player, create a Treasure token."