The Balrog, Flame of Udûn 
Legendary Creature — Avatar Demon
$0.29 #21198 0.18 3.2 years
Trample
When a legendary creature an opponent controls dies, put The Balrog on the bottom of its owner's library.
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Cards similar to The Balrog, Flame of Udûn 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.
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"Whenever a creature an opponent controls dies, you may pay 
. If you do, create a 1/1 white Spirit creature token with flying."
. If you do, create a 1/1 white Spirit creature token with flying."
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+1 more matching line
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"Trample"