Last Light of Durin's Day 

Enchantment
$0.26 #14414 0.01 0.2 years
Whenever a Mountain you control enters, put a quest counter on this enchantment. If it has six or more quest counters on it, sacrifice it. If you do, search your hand and/or library for a Dragon card and put it onto the battlefield. If you search your library this way, shuffle.
Mountaincycling
(
, Discard this card: Search your library for a Mountain card, reveal it, put it into your hand, then shuffle.)
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Cards similar to Last Light of Durin's Day 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.